I was in a walking boot last May. I got a plastic bag from the gift shop and put it around my boot and stuffed the opening of the bag in the top of my boot so that it was sealed all around, if that makes sense. I did this for wet rides, and also when it rained! It kept my boot completely dry.
I would not recommend taking your boot off for rides because you could leave yourself open to re-injury, especially with all the moving, etc. I could wear my boot on every ride, no problem. Sometimes I would just sit and swing my legs over or use me arms to stabilize me, like getting onto RR.
Kali River Rapids was the hardest, not because of the water, but because you HAVE to walk a ways to the ride, and it's a turntable. When I went, I still had a lot of pain and swelling, so even though I had a boot, walking was still very difficult, especially with the heat, which added to the swelling. The line down to Kali does have railings, so I just mostly held onto those, and then my husband on the turntable. DON'T try the take off your boot for this ride. Hobbling down is too risky, especially when a plastic bag around the boot secured in the top of the boot will keep it dry.
Take your time and be careful on every ride. There is never any rush to get on a ride. CMs can slow things down if you need it.