We recently looked at property in Puerto Aventuras. It is a very nice area - gates, quiet and safe. I also have talked to a number of shops there but have never used them. There are a few good sites in that area. They also will venture up toward PDC as well to some of the southern sites. If you go up towards PDC I would recommend calling on Steve Flanigan at Reef Quest. We have been diving with him since Geofish closed a number of years back. He is very accommodating and can tailor to suit your needs. Have fun!