ds went two years ago to disney and universal with an arm cast. when he broke his arm he was devastated thinking he would not be able to go on any rides. I called the parks and they basically said he could go on any of the rides, even the roller coasters. He did go on every ride, including the roller coasters. On the water rides we put the poncho around it. The only trouble we had was at IOA, we were sitting on the dueling dragons ready to take off and they stopped the ride. They said his broken arm had to be on the outside so that he would not hit anyone with the cast. We also tried the water cover thing for the pool but it did leak. The only thing we did not do that we wanted to do was the water parks. he loves the tidal wave pool and I thought it was too dangerous for him with the cast so we avoided the water parks. to answer you question, disney and universal will let you ride any ride with an arm cast.