You didn't say if you are having any guests or not or it is just you and a few people. Some of the resorts give free or reduced-price weddings if you stay there. I would suggest at least a short visit so you can visit they many options after you have researched. There are SO MANY place/properties, it is not easy to pick by looking at pics. We found that you find out a lot more by seeing the place in person. Looking through this website, it looks like the RIU Palace and Dreams are the most popular places. It also depends on how private you want your event. If you do it at one of the hotels, anyone walking along the beach or in the vicinity of your ceremony will be able to stop and watch. Some people are not very discreet.