Caernarfon makes a great day out. I flew there from Blackpool before Easter, and it's an easy run down the coast, with beautiful views all the way, including the airfield itself. A taxi into the walled town takes about 20 minutes and costs £15.
The Kirkbride trip also has spectacular views en-route, but the airfield is a bit barren, if cheap (£8) and friendly. However, you will not be welcome if you land without PPR.