I do second what Paul said about the mini-suites. I am a big guy, 6'2" and was 250 lbs. when I sailed on Island Princess. The mini-suite bathroom was great. You do have a large step up over the tub that can be a problem for some folks. I stumbled on a couple of occasions but I stumble on flat ground.
I don't think you will have too much of a problem other than having to be dragged off the ship at the end of the cruise because you won't want to leave. <VBG>
Have a great cruise!