We are debating the exact same thing! Ceremony is at 3:30 - we were thinking of doing cocktails from 4:00 - 5:00 but then I didn't want to start dinner until 6:00 - We were at a wedding in November in the RM and that is what they did - ceremony was at 3:00 - met for dinner at 6:00 and in all honesty we kind of wish something had been organized because we ended up going to the beach bar in our wedding clothes ... that being said it sort of depends on the resort too.. I think perhaps you could have people off from 4-6, do a cocktail reception from 6-7, then do dinner... after.. would that work?