my boyfriend and i are taking our first cruise in october on majsty of the seas.this may seem like a silly question but i was just wondering, once you're off the ship in one of the ports can you board the ship and then get off again? we will be in nassau for about 16 hours and that seems like a long time.what if we want to go swimming or snorkeling and then get back on the ship and shower before we do any sightseeing? i'm just a little confused.