paradisus is beautiful you'll have a great time.
What you can do is talk to one of the staff members and tell them that you want a nice relaxing day alone with hubby, they will probably know a friend who can take you out for the day and tour around the island or out on a boat.
We've done a day trip to Bay of Pigs, and it was wonderful, one of the best days of our holiday. Great snorkelling there.