Typhoon Lagoon and Blizzard Beach (The Water Parks)

I'm not going to cover each in detail because they're pretty similar. Both have a wave pool, a lazy river and enough slides for everyone to find something they like (huge drops, long windy twists, speed, etc). Just remember that the pavement is hot - so you'll want to roam around between attractions with at least flip-flops if not something more. Again, some attractions have height restrictions... but both parks have a kids-only area, too. So you shouldn't have any disappointed children.