Go on-line and search. I may be against the law if they don't accommodate you if you call before time and let them know your concerns. They yell discrimination if all races, religions, handicap, etc, is not treated equal, so you should have a complaint if they don't accommodate you. Make a fuss about it. These places should have to change there furnishings to accommodate plus size people. Too many people judge on weight, instead of who and what you are as a human being. Someones fat? SO! maybe, maybe not. They don't know what the reason is they just judge.
I don't think any resort or establishment would want to run the risk of offending their potential customers by advertising services specially designed for plus size individuals. You can certainly ask the hotel personnel whether they have any special accommodations and I am sure they'd be happy to answer your questions.