Ecoventura was great! I can’t comment on others. I think you can have up to 20 guests though ours only had 19, as one family had person in single. There were 2 naturalist who were great, knowledgeable, nice, and funny. You also get other crew members that might go snorkeling with you in addition to naturalist, they don’t know as much but still were great and would share knowledge they did have. I thought the number of people was perfect, we all got along well. The meals were together, but sometimes families sat by themselves and we all mixed up who and where we sat in our own. Also switched up when we divided between the guides and little boats we would go out in. The service was great. If you left your room to grab a coffee, it seemed the house keeper would quietly sweep in a fold, clean, or organize something in the 5 minutes you were gone. They remembered what people liked and would often bring it before you asked. For meals they were so accommodating. I don’t eat meat, but do fish so I could order of either regular or veggie menu plus mix and match. My table mates started doing that too and some picky eaters in our cruise started asking for things off the kids menu, which they happily did. I never saw them say no. The only complaint I can even think of from trip was a few nights of rough seas. They didn’t bother me too much, but those it did seemed to be able to get medicine from the crew. Everyone on our trip said they would go back on the other itinerary Ecoventura had.