Hey Joe, buddy o pal. I was just there a couple years ago and stayed at the Sheraton so that I could dive Black Rock reef right off their beach. They have a Five Star diver service with a booth on the property. I paid for a guided tour while there. However.....boooooring! Not much to see on that reef but a few sleeping turtles. If I wanted to dive Maui again I’d stay at a hotel in downtown Lahaina, within walking distance of Lahaina Divers. Their boats go out every day, twice a day. That way you are free to do your own thing if you want, plus you can take their daily boat trips as you wish to dive sites like Molokini Crater, the backside of Molokini, Turtle Beach and the Cathedral Caverns on the Island of Lanai, plus many more. You will not get bored that way!
Rich