i did this with some heavy knee braces. i only had 35% reduction of movement. so walking was still possible, getting into and out of attractions was difficult.
1. if you can walk at a decent pace with the braces and they do not tire you out. guess 1 mile of straight walking with ease. you probably ok with walking maybe suggest a cain for extra stability.
2.
ECV/ scooters could save you alot of wear and tear. most days you will walk 2-3 miles. this is a good alternative to help you keep up with your group.
3. other posters have to correct me on this one. Medical band/pass helps to indicate you need more time to get into outof rides. also can use wheelchair entrance.
4. Rest often. its going to be HOT! and the added stress of the braces will not help.