Hi,
I recently returned from a trip from St. Thomas where I dove with Admiralty Dive Op. It was an enjoyable trip, where we did some good diving. However, I would suggest that you try Blue Island Divers. The staff at Admiralty was nice, attentive, and they definitely tried very hard. However, the shop has recently changed management, and althought they're quickly getting acquianted with the island, there were times where we felt as though we would have been in better hands with a more experienced operator. For example, on this first day of diving, we spent over 30 minutes trolling in a small area looking for a dive site. While normally this would be fine if the diving provided in this area was special, at this site there was really nothing that warranted a 30 min back-and-forth (in our wetsuits). This first dive was only 25 minutes (at 60 ft). Not really worth our time and money in my experience (been to Cozumel, Red Sea, Keys, Cabo, etc.). When we discussed the length of time of these dives with the operator, they sited an adherance to dive tables (everyone on this dive was on computers).
We found out after our diving that the shop has recently changed hands, which is definitely info I wish I had before planning my trip. Blue Island was out every morning as we headed to our sites, and they even beat us to a couple of sites (Miss Opportunity). I would suggest you head out with them on this trip, and save Admiralty for the next time.