Hi, we just got back from staying in Puerto Morelos. Rented a villa just down the road from Paradisus. Paradisus looks to be a very beautiful place. You don't mention if you will have transportation but there are many taxi's parked right outside the resort so it would be easy to get to any of the dive centers in Puerto Morelos.
We dove with Wet Set and it was great. They have several dive sites they have found on there own that are incredible! Max we had was 8 people on a dive and Paul has Jon & Debbie running the operation for him currently. They are his new partners. They were great and one thing I really liked about wet set is they don't charge for any extra equiptment. You pay for your dives and if you need BC, Reg, flashlight... it is included in the cost!
We did go out to Cozumel for diving one day by taking the ferry over and using another operation and we were nickled for every item we needed to rent. We always travel with our mask, fins, snorkel and wetsuits but that's it.
Let me know what else you would like to know. I am working on getting my photo's posted but just not there yet. I would recommend a night dive if you have not done one before. We went to Alberts Reef and it was the best. Got to see the turtles, huge lobster, puffers and so much more!
Marsha