S.T.
Funny, but my girlfriend and I were just talking about Lake Casistas a couple of days ago. I have not personally been there, but it's my girlfriend's favorite place to camp. She loves all the activities there are for the kids and says it's so much fun. Her kids are 3 and 4. My kids are 3 and 6. Sorry I could not provide a more personal recommendation, but based on my girlfriend, I don't think you can go wrong. Hope you have lots of fun!!!