Touring in Wales.

We would like to make our first caravan trip to Wales this summer and are looking for a bit of advice as to where to go? We are fairly new to touring caravans as we only purchased our first one last August, although we have had a static in the past in the Mull of Kintyre. We have two young boys, 8 years and 16 months so would need to be a suitable site for them also. We have mainly toured about Scotland but now want to venture further afield. We would very much appreciate any advice from you fellow club members. Thank you.