What's the best place to go for summer vacation in united states?

Question

my kids like water parks and beaches,we already went to wisconsin dells and six flags.

Answer 1

disneyland all the way!

Answer 2

Blizzard Beach - home of the world's fastest body water slide!  Go 60 mph without a tube and get the most fun wedgie of your life!  Not for loose bikinis.

Camel Beach

Dorney Park and Wild Water Kingdom

Hershey Park just opened up its Boardwalk, so depending on the age of your kids, that might be a possibility.