There are places like Anthony's Key in Roatan that are similar, but the quality of the diving is not close to Little Cayman IMO. There are some resorts on the Atolls in Belize, like Manta Island Resort that will probably be similar as well and the diving out there is probably closer to what you get in LC. But read the fine print about accommodations are those resorts, as some of them don't have AC in the rooms, or will let you use it for a separate fee, but only at night. I have gone to a lot of places in the Caribbean and haven't really found anything that quite matches up to what you get from the Clearly Cayman Resorts on LC and Cayman Brac with Reef Divers as the dive operator. Maybe that is why we keep going back to LCBR year after year...