You would have a tough time at the water parks, IMHO. The lazy river would work, and the big pool. The slides are a problem. My son had the AFOs, and balance and stamina issues. (had ankle surgery on both feet, but still can't do the walking needed at a water park. He has down syndrome and autism).
Blizzard Beach is slightly easier, they have a lift to the top. There is a handicapped entrance that they rarely glance at, you have to yell, hey we are here! We have had trouble with that in the past though, too. If you leave your chair at the bottom near the lift, you do not come out there when you come down. You have to send someone to fetch the chair. Also, because my son has autism, they made him ride the gondola chair lift car, in their wheelchair. At the top, they wanted to keep that wheelchair, and have us wait on the long lines at the top without it. We begged to keep it, and returned it when we got near the front of the line for the family raft ride, again one family member had to run back and forth with it, and cut the line to met up with the family. Some slides require you to carry your tube/mat up to the top. We have split up and had some people carry up 2 tubes and we meet up at the top, one takes Sean up on the lift, the rest walk up. It takes some planning.
Here is what we do now. We all go to water park and get there early, and we all take family raft ride. Then, I (mom) take the 3 other kids on slides all morning. Dad takes Sean on the lazy river, etc. We meet for lunch, and afterwards I leave with Sean. (he is usually tired and the sun is too much for him too). We go back and wash up, and relax, I like this part. Dad stays with the other 3, and then he gets to go on the slides, wave pool.
We prefer BB for that lift for Sean, and TL for the snorkling and the shade. (Sean does not snorkel). We realize that the design of the water parks is not really ideal for Sean; that's just life. We love the water parks.