Stay away from "Mary Tours" or "Delcy tours" if somebody is trying to sell you a voucher with this information. This tour was so bad. The service was just terrible. You have no idea. The "guide" was just interested in getting more money from us. He left us on Acuario island for 1h20 minutes while he gave people "the opportunity" of going snorkeling with him for 25,000 pesos. If you didn't want to see the Aquarium (20,000 pesos), well too bad, you had to wait there and there were only a couple of chairs (and no real beach) for 50 stranded tourists that soon became about 150 as more boats came and did the same.
That guy ruined the trip, and the boat was really bad, not at all safe for that kind of trip. Then he took us to playa blanca, which was as crowded as you can possibly imagine (my friend even found a woman's used pad in the sea). He said we had to leave 30 minutes earlier than expected because it was windy. The other boats were still there. Incredible. Stay away. And if you already paid and "Juan" (or Juancho, or Juanchito, as he asks you to call him) happens to be the guide, RUN.More