Check out Deep Blue Utila.
Deep Blue Utila - swim with whale sharks at our all inclusive resort. Utila, Bay Islands, Honduras
There are no telephones or TVs.
There's 10 rooms/20 guests max. It's on the south shore of Utila on the other side of a lagoon channel so the only access is by boat. Really quiet at night. The main building is the lounge/bar/dining room and there's 2 other buildings. It's one of those places where you only lock the door to keep it from swinging open. We actually left our key in the door all week. Food was really good, there's several choices at every meal. Rooms were large, bathrooms were large, there's a full closet and mini-frig. Each has a deck that faces the water - the beach is 50' away. Rooms were kept clean and have A/C and ceiling fans. Like Roatan expect some bugs - we made the mistake once of leaving the screen door open. A little OFF sprayed into the ceiling fan took care of that.
The video on the website gives an accurate picture of what to expect. Due to cancellations we were 2 of 4 guests that week. They do have slow Internet access and WiFi that is accessible in the lounge or from your deck if you have one of the rooms near the main building.
I don't dive Nitrox but my buddy did - it's $125/wk. They dive 3 dives per day and two night dives. The night dives count as 1 of the 3 on those days. There's also shore diving just in front of the resort - there's 3 sites you can get to once you swim out through a break in the coral. I liked Labrynth the best but the resort is directly in front of the Pretty Bush dive site.
It's also a great place to go if you're interested in Whale Sharks - esp. during the spring when they host research weeks. Experts are brought in and you go looking for whale sharks after diving daily. You also can do minor participation in the research - we participated in an attempt to get a small sample of DNA - the whale shark didn't like it much though - I think the tagger was glad they don't have teeth...lol. We snorkeled with 6 over 3 days in late March. Mostly smaller males in the 18' range but one was the size of a bus.
If you can get to Roatan by noon, you can take 2 ferries and be on Utila by 5. Details are on the website. I mention it as it would have cost us $1200 plus 2 connections to Utila if we flew, Roatan was about $600 r/t and the ferries were exactly $100 r/t more. There will be a lot of 20 something backpackers on the ferry to Utila but don't worry, they all stay in town.
Steve Fox, the owner is often online here as [user]Deep Blue Divers[/user]
hth, feel free to PM if you have any other questions. We were there in 2009 so this should be pretty current.