Definitely let the wedding coordinator know you are visiting and set up time to meet with them. Also, prior to going there, narrow down your choices. The water is inviting and instead of doing site visits, you may just want to relax on the beach.
When we went in August, the wedding coordinator waived the day pass fee for us so we spent the day at the resort and ate in all the restaurant. We wanted to make sure that the food and service was great. We planned to visit 2 AI resorts and ended up only going to one, Dreams Cancun. To us, Dreams had everything we were looking for.