Our family of 5 (3 kids 16, 14 and 9) were planning on going snorkling at Yal-Ku lagoon and then to Akumal. My questions are: what time does the lagoon open? Do they rent vest there? Is it worth going to both places as we will have to rent vests at both places? What time does Akumal start to get crazy? We will be coming from PDC. Thanks for your input.