Places to eat:
Seasons 52 (Parnell St) - good food, nice atmosphere
Thai Palace (Parnell St)
Jasmine Garden (Barrack St) - Chinese
Plenty of good pubs around town:
Cruises (Queens Hotel) is always a good bet. Baron McQ's, The Barge Rooms, Knox's, O'Keeffe's are also good.
Things to do in Clare region: Ennis Abbey, Bunratty Castle, Cliffs of Moher, Lahinch, The Burren, Lough Derg, Dromoland Castle. Ennis is also nice town to walk around on nice day - there is a nice river walk which should take about an hour.