Looks like we were on the same cruise. We considered the cave tubing in Belize, but our excursions in Cozumel (3 hour round trip to mainland) and Isla Roatan (2:30 round trip) left us weary for more bus time. If we had to to do over again, we would have done something in Cozumel that required less transportation time. That would have left us more refreshed for Belize, as to appreciate the port of call you really have to do an excursion.