The service information below is correct at the time of writing - 10 July 2014.  However, services do change from time to time, so anyone intending to use bus services should check independently before their visit.  The website address for LYNX buses in Orlando is www.golynx.com .

Public buses in the Greater Orlando area (including Kissimmee) are operated by the city under the "LYNX" branding.  There are many interlocking routes and the system is designed around the need to change buses to reach a given destination.  Most LYNX bus stops are signed with an iconic bus symbol and/or an animal paw-print.  On parts of US192 there are "stations" (named locations) which are used by LYNX buses.

The main thing to note about regular buses (LYNX) in Kissimmee is that, for the most part, they are confined to the strip known variously as US192, SR530, West Irlo Bronson Memorial Highway, Vine Street, or Space Coast Parkway (all are alternative names for exactly the same road).  So, availability of public buses to/from Kissimmee will depend entirely on how close your origin or destination is to this route.  Aside from a minor deviation to the edge of "Celebration", there are few useful bus routes to the south of US192 and only certain routes to the immediate north.  It's also perhaps worth noting that most villa complexes in Kissimmee are not in easy walking distance of the bus routes.

The information that follows is based on starting out on US192.  Of course, all these journeys can be made in reverse.

BUS ROUTES SERVING US192

US192 is served by two bus routes.  Buses stop at marked stops which are every 200 yards or so (except where it's inappropriate - on highway intersections etc.) 
- LYNX 55 starts out in DownTown Kissimmee (note: this is NOT the same location as "Old Town") at the InterModal station where it offers interchange with trains and other LYNX routes.  It joins US192 and runs westwards the length of US192 to Legacy Blvd - a point about two miles short of the intersection with US27.  (There is another much less frequent route serving the remainder of US192 westwards). 
- LYNX 56 also starts out in the east in DownTown Kissimmee, and runs mainly along US192 to "Old Town", into the edge of "Celebration" and then non-stop to Disney's Transportation and Ticket Center.

US192 is divided by a major intersection with two other routes - I4 (interstate) and World Drive.  When starting out, it's important to establish whether you are west or east of this intersection.

STARTING OUT WEST OF I4/WORLD DRIVE
For any other destination west of I4 up to Legacy Blvd, use bus 55 direct. For any other destination on US192 eastwards to DownTown Kissimmee, use bus 55 direct.  For other destinations, take an eastbound 55 and then follow the directions under "Starting Out East of I4/World Drive" below.  Note that, if the directions require you to travel westbound on LYNX 56, you will need to transfer buses at "Old Town".  Get off the 55 here and cross the street.

STARTING OUT EAST OF I4/WORLD DRIVE
Local

For local destinations on US192 west of I4 up to Legacy Blvd, use bus 55 direct.
For local destinations on US192 east of I4, use bus 55 or 56 direct;  Both serve stops as far as Osceola Square, and then continue to DownTown Kissimmee Intermodal Station.
Attractions
Disney Attractions (except DownTown Disney):  Take a westbound 56 and alight at Disney's Transportation & Ticket Center (TTC).  Use Disney's free transportation (ferries, buses and monorails) to the attraction entrances. If there is no Disney bus service available at the TTC for Hollywood Studios or Animal Kingdom, walk about five minutes to the Polynesian resort and use their resort - attraction service.
DownTown Disney:
  Take a westbound 56 and alight at Disney's Transportation & Ticket Center.  Transfer there to LYNX 50 which will take you to DownTown Disney. 
Sea World:  Take a westbound 56 and alight at Disney's Transportation & Ticket Center.  Transfer there to LYNX 50 which will take you to Sea World.
Universal Studios/Islands of Adventure:  This is not a convenient or easy trip to make from US192 by bus and you may prefer, therefore, to use a taxi or shuttle.  There are several routes you can take; this is probably the easiest:  Take an eastbound 55 or 56 to the Intermodal Station, DownTown Kissimmee.  Transfer there to LYNX 108 and alight at the Florida Mall.  Transfer there to LYNX 37 to Universal.
Busch Gardens:  This is way outside the area covered by LYNX buses.  To get here, you'll need the Busch Gardens shuttle express which picks up at several places in the area.  Probably the easiest pick up location to find on US192 is at Old Town. LYNX 55 and 56 both pass Old Town.  The Busch Gardens shuttle is a once-per-day scheduled service, free to holders of Busch admission tickets, but you need to book in advance by phone or online to be sure of getting a seat. The service is not part of LYNX, but you can, of course, use LYNX to get to the pickup point if necessary. More details and online bookings here https://secure.mearstransportation.co...

Shopping and other venues
Local: There are various local shops, flea markets, and so on along the US192 strip as well as the Osceola Square Mall.  Use buses 55 and 56 as necessary.
WalMart:  Buses 55 and 56 both pass by a SuperCenter on Vine Street in Kissimmee - for most likely points of origin you'll need to start out going east.
Florida Mall:   Take an eastbound 55 or 56 to the Intermodal Station.  Transfer there to LYNX 108 to the Florida Mall.
International Drive and the Outlets:  Take a westbound 56 and alight at Disney's Transportation & Ticket Center.  Transfer there to LYNX 50 and alight on Sea Harbor Drive (at or near Sea World).  From here, most of the local retail and restaurant venues, including Premium Outlets - International Drive, are north.  Transfer to LYNX 8 going the same direction as the bus you just got off.  Premium Outlets - Vineland Avenue is south;  cross Sea Harbor Drive and transfer to LYNX 8 going back the way you just came. 
Mall at Millenia:  go to Premium Outlets - International Drive as above above then take bus 24 to Millenia.  24 runs only once per hour and stops fairly early so do check the schedule
Orlando International Airport:  Take an eastbound 55 or 56 to the Intermodal Station.  Transfer there to LYNX 108 to the Florida Mall. Transfer there to LYNX 42 or 111 which will take you to the Airport.  If starting out at the airport, note that the LYNX stops are located on the A-side of the Main Terminal, on the Ground Transportation Level (Level 1), at Commercial Lane spaces A38-A41

LYNX SCHEDULES (TIMETABLES)
Download schedules for all these and other LYNX services at
http://www.golynx.com/travel-informat...
Note that schedules only give scheduled times at certain timing points.  There are many stops in between these.

LYNX FARES AND PASSES

If you're going to make more than 8 one-way trips over more than 3 days in a 7-day period, then get a weekly pass - $16 for a week's unlimited use. These have to be bought in advance;  you can buy online at  http://www.golynx.com/fares-passes  (pick the $16 7 day pass).  They will mail to overseas addresses.  Or you can get them at certain retail outlets in the area including the various branches of ACE Cash Express.  In any case, passes are validated on the bus the first time of use and the period of validity starts then.

Otherwise, LYNX costs:
$2 each person one-way regardless of distance. Transferring buses (eg from 55 to 56 to 50 for Sea World) is at no extra cost so long as you ask for a transfer ticket when you board and pay.
or
$4.50 for an all-day ticket (if you are going to make more than 2 one-way trips in a day)

You can buy one-way fare and one-day passes from the driver. No change given.  If buying a Day Pass, tell the driver you want one BEFORE you start feeding money into the machine.

Children aged 6 and under travel free

Concessionary Fares

Concessionary fares are available to qualifying persons aged 7 to 17 inclusive, and to those aged 65 and over.  Concessionary fares are exactly half the adult rates for all tickets and passes.

In order to qualify for any concession, LYNX policy as stated on the website is that official LYNX ID must be carried in all cases.  These are only issued in person at LYNX Central Station in DownTown Orlando.  The logistics involved in obtaining this may not be justified by the relatively small cost saving.  However, LYNX Customer Services have also advised that overseas visitors may present official ID issued by their local transit authority and this will be accepted.  And an unofficial source advises that any official proof of age is sufficient.  Certainly, if merely paying a cash fare, presenting non-LYNX ID is worth trying. 

However, in respect of 7- and 30-day passes, the rather less than official position suggests there is an element of risk involved in attempting to use such a pass without LYNX ID and visitors may prefer to either allocate time to obtain an official ID or simply to buy full-fare passes instead.  It's also worth noting that discounted passes are not sold at most outlets; they can be purchased on-line and at LYNX Central Station.

FINALLY

All the services mentioned above have a daytime frequency of every 30 minutes or better and run every day of the week, including holidays. Most also run well into the evening at the same or similar frequencies. The last 56 leaving Disney, for example, leaves at 11.20 pm daily. But do study the schedules for precise timings to minimise waiting and to ensure you don't miss the last bus home.

It's worth emphasising that LYNX bus drivers are mostly helpful, patient and co-operative for the most part and will answer questions and give guidance. You will quickly get the hang of it.