Oops! Hit the return key too many times!
I started this thread last year looking for info for our trip. My wife and I along with her sister and sister's husband stayed there in June of 2003. Get ready for the best week of your life! Seriously, we have stayed in tropical locations around the world in a variety of accomodations, and the week at Playa Blanca Island Villa was one of (if not THE) best weeks we have ever had on vacation. (And no, I don't own the place!)
You have pretty much complete freedom to do whatever you want while you are there. If you want to fish, Alberto will take you fishing. Want to snorkel, he knows the best spots. (Mexico Rocks is just a few minutes away from the house.) He took us to Shark/Ray Alley and Hol Chan in the early morning before the tours got there and we had the whole place to ourselves! While you are gone, Mar will do all your laundry and make fresh homemade tortillas to use with your fish tacos that you can make yourself with the fish you catch.
The only negative I can think of is that Alberto is not licensed to drive the boat after dark, so if you want to go to town for dinner, you will need to take a water taxi back home.
If you want more details, give me a buzz at firstname.lastname@example.org