The lobby bar would be great for a cocktail hour for drinks, food not so much. I only saw fruit, nuts, and popcorn out mostly, and late at night there were little sandwiches and desserts. But seriously the dinner is 4 courses and SO much food I don't think your guests would want to eat before and depending when your ceremony is they will have likely ate lunch not too long before. We had our ceremony at Playa Azul so it made sense to have the guests got to the pool bar near by and the reception was right next to that bar as well. I would say whatever bar is closest to your ceremony or reception site would work to send your guests for drinks. I wouldn't waste money on a cocktail hour for sure.