Dive sites from West End are about a half hour boat ride in a protected five mile wide channel that feels like open water without the waves. Dive sites from Road Town would be about 15 minutes less. There are usually more divers from the Road Town location, however and sometimes the number on a boat is substantial. The dive package includes three boat dives per day. Shore diving is not really available.
Night dives are available but extra.
Virtually all dives sites have significant fish and coral populations. Some dive sites have greater chance of large pelagics. However this was on the Atlantic side of Tortola which is rarely dived. Angels include Queen, Gray, French, Rock Beauties. Many varieties of Parrotfish, tangs, damsels, chromis, etc.