Go from Ennis to Bunratty on Bus Eireann. The return fare is 6.80 Euro. Make sure you stand in the correct slot, as the drivers may or may not tell you if they are stopping at Bunratty (even though I specifically asked). Take the Cork bus via Limerick, not the direct Cork bus.
Bunratty Castle, even in off-season, is still a tourist attraction. Entrance is 11 Euro and includes the mock Irish village and the castle. It is very enjoyable and a good walk back in time. Across the road from Bunratty Castle are some shops and restaurants. The Creamery bar has a lunch and dinner menu. Lunch sandwiches with chips cost 6.90 Euro there, and it is located across the car park from Blarney Woolen Mills.