BB - they will love the Ski Patrol area, perfect for their age. Whole park is cartoon themed and the kids love it, lots of slides, ski lift, family raft ride is great, lazy river and a wave pool that isn't so rough as TL.
Ditto on getting there early and securing a spot. We usually head to the far corner of Ski Patrol area for a table that is covered and has chairs as well. (get map and go to the right) Take a small cooler with drinks, snacks and then buy your lunch. Food is reasonable. We all love to eat the kids meal - sand bucket/shovel with a grilled cheese soft pretzel etc. Great value and it's yummy in the tummy. Get waterproof cameras and take them on the slides and all over. You'll get some great shots! You'll have a blast.