Hi!
I have a 7 YO and we just got back from Disney. We did Blizzard Beach. THere is a part there for pre-teens. There was a T-Bar spot where kids could hang on to the TBar til they came to the end and were thrown off into the pool. Also there was a main pool with icebergs and the kids had to hang onto a net and navigate across the pool on these icebergs. There were several waterslide type attractions geared for their age. My son also loved the larger tube waterslides, and the wavepool.
Have a great time!