Doodlebug - I still say BB. The kiddie area has some fun slides in it for your 4 year old, is set apart and very expansive (TL was a late addition and alittle chaotic for me). They will love the Ski Patrol area, it is really cool. It is for the elementary age set of kids. The cartoon theming is lots of fun. Both parks have lazy rivers. The plus for BB is the giant wave pool is so much more calm than TL. I was at TL with a 4 year old and he got beat down - just felt unsafe and so he missed out.