I'm sure we were in a managed cocoon, but the Oceans for Youth trip on the Jardines Aggressor was fabulous. I've dived all over the world, and this was right up there. No, not the Phillipines or Fiji or Indonesia, it is in the Caribbean after all, but multiple sharks, lots of groupers, huge schools of critters you see few of elsewhere in the Caribbean, healthy coral, lots of it soft, decent viz, and terrific boat and crew. The pretrip to Havana was really interesting with a first-rate tour guide assigned to our group. Good food. No, we did not drink the local water. In fact, most places we go kin the world we do not drink the local water.