I did see one of the ADA cabins and it looked great, lots of space to manuever a w/c in and nicely laid out. sorry I dont know about getting off in ports, but since the ship didn't tender at any of the ports on our cruise it was easy off. if you are tendering at any port, unless they are helpful it is hard for able bodied people to get on a tender if the seas are rough
most ships staff are extremely helpful in getting in tender boats, Ihave seen them together pick up man in large wheelchair and safety and smoothly get on tender.
I think on western carrib cruise the only tender stop is grand caymen?