Probably not
Most are slides and lazy river. Would no recommend someone with aa cast for water rides.
Volcano bay just like other Universal rides have provided lockers
There are certain rides that do not allow people with casts on either arm or legs on.
Some rides require you to take off all lose items such as hats , glasses chains , watches and phones. Mostly the fast single person slides only requires you to.
Yes you can plenty of guest come prepared with waterproof phone cases even myself.
I don't see why you couldn't as long as its water proof
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