Depending on your age and level of activity you enjoy, you may like some of these options. Ithaca is a great place for outdoor activities because the city is beautiful and there is lots of recreational areas. Here are just a few Ideas of things to do in Ithaca, NY:

Farmers market: It's more than just a farmers market, it's a great place for lunch on the weekends (try to go on Saturday at least)!  http://www.ithacamarket.com/

State Parks: Great for walks, hikes, and picnics. There are spectacular waterfalls in the many parks, which include Treman, Taughannock,  Watkins Glen Park,  Fillmore Glen, Long Point, and Buttermilk Falls. It's best to take two cars so you can park one at the top and one at the bottom to pick yourself up after walking downhill. http://nysparks.state.ny.us/parks/ 

Horseback Riding: There are many places to choose from, favorites being ones that offer trail rides like  http://www.paintedbarstables.com/ 

Wine Tasting: Sample local wines and have lunch a vineyard. If you bring guests under 21, fresh sparkling grape  juice is available. http://www.cayugawinetrail.com/

Ice Cream and a Walk at Cornell Plantations: Ithaca is the home of the original ice cream sundae. A must for ice cream lovers, Dairy Bar makes it from milk produced by their own cows. http://www.dairystore.cornell.edu/ 

South Hill Trail and Cascadilla Falls: On Linn Street, walk uptrail toward Cornell to see the Cornell "library-Harry Potter room near the bell tower"  then walk back to commons down Buffalo street (free)

See a Show: Ithaca offers an abundance of local theatre and music venues.

Hangar Theater: Ithaca's premier professional regional theatre presents musicals, plays, children's theatre, cabarets, and events www.HangarTheatre.org

Also try the State Theater, Kitchen Theater, Ithaca College Theatre, Cayuga Chamber Orchestra, Ithaca Ballet, and Cornell's Schwartz Center.

Rent a boat: canoe or kayak on Cayuga Lake http://www.puddledockers.com/ 

Sledding: Take a ride down Rice Hill, bring 2 cars (free)

Laser Tag: Ithaca Extreme Laser X (great for kids)

Paint Ball: http://www.ithacapaintball.com/ 

Almost-Free parks at Myers point , Stewart park (has a merry-go-round), Ludlowville park -waterfall, also try to find Ithaca's Lost waterfall 

Cayuga Nature Center: (night and day hikes)- for young kids they have a great tree house and butterfly green house http://www.cayuganaturecenter.org/

Fuertes Observatory:  at Cornell, Fridays, first of the month http://www.astro.cornell.edu/faciliti...

Cornell Sports: hockey/football... http://cornellbigred.com/

Bowling: at Helen Newman Lanes

Climbing: Rock/ Wall climbing at Cornell/  COE ropes course/Cayuga Nature center ropes/ Ithaca, -must have a cornell student or staff to with you to do this is using Cornell facilities 

Cornell Chimes Concert: climb up tower, can request songs while you are there- free

Sap Sucker Woods: trail and visitors center, -Cornell Lab of Ornithology (free)

Shopping: Downtown Ithaca Commons on State Street, Syracuse mall, Outlet mall in waterloo, Ithaca mall,hour-ish drive http://www.premiumoutlets.com/outlets...

Windmill: in Penn Yan- go early in morning for a breakfast and shops http://www.thewindmill.com/

Tennis: at Cornell, Local grade schools, Ithaca College,  or Ithaca high school courts (free to use courts- bring own rackets) 

Swimming: and fitness at the YMCA, Cass Park in summer (has a water-slide) or other fitness center

Go-Karting: at Ringwood (~3$ a ride I believe) Ringwood Raceway

Greek Peak: in winter for skiing, tubing, indoor water-park/cross country skiing at Podunk/ Snowshoe at Cayuga nature center http://www.greekpeak.net/

Ice skating,: there are ~three Rinks in the Ithaca area

Day at a Spa: Google which one you like there are many good ones

Johnson Art Museum: they change their exhibits a lot (free)

 See a movie: Cinemapolis on the Commons, Cornell Cinema, or Regal Cinem

 -first, second, third dam, cliff jumping and swimming in summer (not sure they still let you do this) /or just walk down there and see the beauty and take photos for your blog or facebook

 -Walk around Bibi lake, better yet is to jog or run around it and take photos, it has a trail around it

 -For foreigners, they always like to see Wegmans for some  reason, get some lunch there

  - brain collection in Uris Hall, Cornell …

-Saturday at  Sarah's Patisserie, Ithaca bakery College town Bagels…so many places to eat

 -Tour around of the local colleges, Cornell, Ithaca college,Wells, Cortland, TC3

 -Trips to Niagara Falls, sky diving, paragliding, http://www.ilovethefingerlakes.com/re...

 -Visit Canada, NYC, Adirondacks mountains for day trips

  -Corning glass museum http://www.cmog.org/

 -Museum of the Earth http://www.museumoftheearth.org/

 -Science center, for younger kids mostly- great way to learn about science though http://www.sciencenter.org/

 -East Lake Recreation Center (indoor playground for kids with a big slide with balls to fall into) http://www.eastlakerecreation.com/ 

 -Ithaca art trail, good if you like looking at art and paintings, don't recommend for kids unless they have a special interest in art  http://www.arttrail.com/

 -Sunday night Bound for Glory concerts (free and recordedweekly on the radio) http://wvbr.com/bfg

 -Religion centers:  church, temple, mosque…

 -Yearly events: grassroots, Ithaca festival, apple festival, (many festivals on the commons) friends of library book sales, check local paper to see what’s going on

 -Get a Positive News and read it, its unique to specific places, one of them being Ithaca

 -Build a camp-fire  at a state park and roast apples, baked potatoes, marshmallows etc. or on the lake  

 -Evening dancing/ contra dancing/ salsa dancing etc. (look up online to see exact places) 

 -Golfing/ minigolf  http://www.countryclubofithaca.com, The Rink/Field  has mini golf 

 -Rent a bike for the day on the commons then go biking around trails or near Cass park fitness trail, there are also tours that offer biking in the finger lakes areas, try the Out Door store or one on the Cornell campus

 -visit  surrounding towns such as Trumansburg, Aurora, eat dinner there, or just  pretend you are a tourist in your own city

 -Cornell walking tour offered by the campus-find out about their campus, Ithaca college also has tours, Wells College also has tours

 -attend a lecture by a Cornell professor- you can find free events on the Cornell calendar website or from Ithaca times or Ithaca journal events pages…http://www.cornell.edu/events/

 - Visit a U-Pick farm -Pick your own fruits/veggies. Depending on the time of year there is  blueberries, apple picking, strawberry picking, picking flowers etc. at different farms around Ithaca…"type U-Pick Ithaca" into Google, there are lots of results

  -Attend a Happy hour at a bar or on an Ithaca boat on the lake in evenings  http://www.cayugalakecruises.com/home...

-If you need an "Ithaca experience" try dances of universal peace at http://www.foundation-of-light.org/

-Hot Yoga/regular yoga in Ithaca, Google it there are too many places to list 

 -Go around to each pizza place in Ithaca and try a slice of each, there are so many good places, for example the Nines at night has music often, Pizza Aroma is good for the day

-Want to see the best art by local artists? Visit the State of the Art Gallery at 120 W. State Street just west off the Commons. Always exciting and innovative art works. http://soag.org.

 

**Please add any other links or ideas to the comments, this list is by no way complete, its just a few ideas.***