I stay at Vista del Mar in their condos a couple times a year. If you are diving with Akumal Dive Adventures you will have an enjoyable time. The DM's, Jose and Lupe, are laid back, easy going. The usual sites they go to are Yalku, Yalku Norte, Half Moon, Grouper, Tarpon, Gorgonians, Miramar, Seahorse, The Nets, Aquarium, La Tortugas, and a handful of others that I can't recall off the top of my head.
VDM is in a great location right in the middle of Half Moon Bay. You're about a 12-15 min walk from "town" (Akumal Bay).
In Half Moon Bay, La Buena Vida is good for happy hour and since they got a new chef post-Wilma, the food has really improved.
Also on Half Moon Bay is La Lunita. Lovely atmosphere right on the beach by candle light. The prices have gone up some but it is nice and food and service are usually good.
In "town" Cueva de Pescador is good seafood and very strong margarita. (I like their lime daquari better). Turtle Bay Bakery & Cafe is great for breakfast and lunch. They also do a very nice dinner. In low season they are not open 7 nights so check their hours. Also in Akumal Bay is Lol Ha. I used to like it but in the past couple years the menu seems to have gone more American/Continental and I miss the Mayan/Yucatan/Mexican selections they used to have. Good happy hour at Lol Ha beach bar and they usually will play sporting events on their tv's.
If you like pasta then try Que Onda, which is by Yal Ku Lagoon, about 10 min walk from Vista del Mar. Homemade pasta and very fresh sauces. A nice garden setting.
If you have time, try a cenote dive. You can either hire a guide (Dennis from Diablo Divers is very good), or go to Hidden Worlds (
www.hiddenworlds.com). With Hidden Worlds you can do a single tank if you just want to try it and not sure you want to do two.
Have a great trip!