People that have a weight problem are really not anymore restricted onboard a ship than elsewhere. As one noted you cannot do Helo tours and a few others like horseback riding or parasailing etc might not be available to you. Now do understand that the shower in the cabins are rather small compared to your home or a hotel room but you should manage. Hopefully it is a problem that you may be able to work on and get some of the excess weight off of you simply for health reasons. Not only that but you will feel better and feel better about yourself as well, we all do. Best of luck to you.