Conman418

So I have a cruise booked for the end of next month to bermuda. Me and my bf are planning on doing coral reef snorkeling and the weight limit is 250lb. I weigh 253lbs, and I am actively losing weight. However, in the event that Im not under 250 by then Im concerned. I know how to swim and can climb a ladder onto a boat, im sure of my abilities to do the activity. Do they weigh you before going on the catamaran, or will they take my word for it if I round down to 250. I just dont wanna be turned away from an activity I paid for just due to a few pounds.