Just tell them....they never really get to see much of anything but the boat. And if they like that, great. My favorite place is not far from the dock where the "day trippers" come in on smaller boats from Belize City. Sitting at the palapa restaurant there, many of them seem to complain that they have so little time. Needless to say, they can also take inland trips directly from Belize City. Same problem. They only have a few hours to visit. So, if that works, good. But they are not going to see much more than the boat. Suggest that they ask the company they are working with how long they will be in any port, then they will have a better idea if it will work for them or not.