Instead of staying in an AI, look at something in the West End. Coconut Tree rents cabins for around $50 or less/nt. And dives are in the $25-35 range. You can do both with Coconut Tree and save on a pkg. deal. The cabins are rustic but decent. If there's 3-4 of you, the 2BR cabin had a full kitchen including a full-size stove/refrigerator.
Coconut Tree Divers - PADI 5-Star IDC Dive Resort on Roatan, Honduras
Lots of other housing options in all price ranges also, look at one of the Posada's (Los Orchideas or the other one) or Seagrape. Cocolobo looked nice but it was a short walk to town also. And there's some cheaper cabins across the road from the water in town. Don't know which one it was, but there was one behind the Argentinian Grille that looked decent.
Some options in all price ranges:
Hotels and accommodation in Roatan
There's a small market at CTD, Woody's market a block away (think big 7-11) and a regular sized market in Coxen Hole. Food was really cheap, from a pasta place for lunch at about $5/meal to a full dinner for under $20. Even steaks at the Argentinian Grille weren't much more. At Rotisserie Chicken dinner for 4 (2 chickens plus sides) with food left over cost me $21.
Capt. Vern runs the previously mentioned catamaran to Utila.
Ferry between Roatan & Utila daily with Capt Vern on the Nina Elisabeth II Catamaran He docks at Coconut Tree's dock in the West End - about 20mins. from the airport by cab.
Or if you can get to the ferry port at Dixon Cove b4 2PM, you can take the
Galaxy Wave back to LaCeiba and connect with the
Utila Princess at the adjacent dock and be on Utila about 5:15-30. It's around the same money as Vern, cost us just over $100 r/t. The return ferry leaves Utila at 6AM and there's a longish wait for the Galaxy but you arrive back on Roatan late morning - plenty of time to catch the CO flight.
It's possible via the Continental flight from Houston that arrives at 12:10 but it's cutting it close due to Roatan Immigration delays. We did last spring and arrived at the ferry port with about 20 mins. to spare. And we were almost dead last in line as they didn't open the back door on the plane. I'm sure you know this but the right side lines are shorter...