If your children can swim on their own, I'd suggest Blizzard Beach. As you enter the park and get a locker, ask for one by the Ski Patrol Area. This is a preteen area and there are icebergs for climbing, small slides for sliding, this is a great place to play in the crowded afternoon. Once you get your locker and unload your stuff, grab a chair or a table that's under roof. Dump your stuff and head straight for the family slide, (either head up all the stairs at ski patrol or take the chair lift.) Once you ride the family slide, head to your left and hop in the lazy river. Get off at the 1st exit on your left hand side. There are tube slides there, 3 different ones. Then hop back in the lazy river. Get off at the next stop on your left. This is where the wave pool is. Skip the wave pool and head to the speed slides. There are 2 here. One is a tube speed slide, the other is a body on a mat speed race. Both are fun. Just a word of warning, both my son and I become airborn on the tube speed slide. It is fast! After this head to the wave pool. If you are there early enough, you can grab an innertube and relax. Ok by this time it is lunch time and you've done all the major slides, except Summit Plummit. Eat lunch. Enjoy the rest of your time at the ski patrol area, lazy river and wave pool. If either of the children would feel more comfortable wearing a life vest, you can "rent" one at the locker rental at the front of the park. You just have to give them your room key or driver's license to "rent" it.