fair warning this info is from around 4 years ago... Caye caulker is very rustic, minimal "tourist shopping" and minus the main drag not much to do in the evenings. having said that the vibe during the day was very peaceful and the diving was great from my memory. however the island did have a run down feel and I had a half ***ed attempted mugging take place on the evening so less than enthused with the vibe in other ways. personally i thought placencia was much nicer, plus no beaches to speak of in caye caulker for the wives to relax at, google "the split or spit" at Caye Caulker. We went as backpackers and felt it was a weird mix of overpriced "island rustic for retired rich white people" and a run down island with an inordinate number of crackheads and angry rasta's. I have never heard "white boy, give me a dollar" as often as on Caye Caulker, Belize city was better and that was no scenic walk in the park. Ambergris is very much a built up, touristy, shinier island, more shopping, more dining, more expense. Didn't dive out of Ambergris but spent a few days there, and dove north of Caye Caulker a few times so might have some dive site overlap. Overall impression, overpriced, good food, fun and safe diving, good rental equipment (before I had my own gear), some crack cocaine issues, probably won't go back. Again just my impression, lots of people love Caye Caulker and Ambergris. For the wives sanity might consider Ambergris, but can't speak to their beaches if any. Best thing I can say is youtube helps a lot to get a feel for the environment in my experience, watch some videos and see what you think. Highlights of the 2 week trip.... beaches at placencia, sailing trip down the coast with raggamuffin tours, and outdoorsy stuff inland at a San Ignacio area jungle lodge. hope this helps and let me know if you have any specific questions. Stayed at Colinda's Cabanas in Caye Caulker (nice but rustic), some beige box in Ambergris, forget the name.