For getting your bearings... 

http://www.shannontourism.com/

 By Air:

Shannon Airport has a wide selection of scheduled flights

http://www.shannonairport.net/flights... 

http://www.shannonairport.ie/gns/Pass...

By rail.

There is a new station in Sixmilebridge which is a couple of miles from Shannon. All over 65s can travel for free. There is a regular bus and cab sevice to Shannon from Sixmilebridge. (See below) This service is a stop off between Limerick and Galway, and there is a  regular rail service to Limerick  from Cork, Kerry & Dublin.

 http://www.irishrail.ie/your_journey/...

 

By bus:

A regular service to Shannon airport / town from Ennis & Limerick via the Oakwood Arms Hotel.

http://www.buseireann.ie/pdf/12701120...

http://www.buseireann.ie/pdf/12023866...

http://www.buseireann.ie/pdf/12023866...

 

 By cab / taxi:

http://www.shannonairport.ie/gns/Pass...

http://www.shannon.ie/Tourism/tou_get...

http://www.pkexectravel.com/

 By car hire:

http://www.shannonairport.ie/gns/Pass...

http://www.aaireland.ie/routes_beta/