If you have a four year old and the weather is iffy I can highly recommend Marown Church - they have loos and fab food but also a great play room upstairs in the church with loads of toys, DVDs etc. We were there a few years ago on the very long day of the cancelled senior and were made very welcome.

Conker trees is also good if the weather is fine, lots of room the little one to run around, clean portaloos and good value food.

Have a fab time