Swarth - Vista del Mar and Akumal Dive Adventures are great. We're leaving Friday for our 4th trip in 3 years. (This time 4 days Akumal/4 days Cozumel). The dive shop is very laid back and great with new divers. 3 single tanks a day at 9am, 11am and 2pm, or there abouts. The diving is very easy drift, very relaxed. Lupe and Jose are good DM's and will give you as much or as little assistance as you need or want both in and out of the water. They are both good and finding all sorts of interesting things to look at. You dive to 500psi, never rushed. If anyone is low on air and the rest of the group is ok, then you just surface with your buddy and the rest continue on their dive. If the dive runs long then they just push back the times for the 2nd and 3rd dives. The condos are nice, not fancy, but clean, well kept and spacious. The location is perfect right in the center of Half Moon Bay. You'll be about a 12-15 min walk to Akumal Bay ("town") and about 10 from Yalku Lagoon. You might want to consider doing a snorkel trip with Hidden Worlds so you can experience the cenotes. If you like it, then do the cavern dive next time.