We are taking our boys to Marina El Sid in Jan. We chose the resort based on price and it's reputation as a family resort. the only thing that it is lacking is the beautiful tropical beach. So I would like some opinions on a day trip or catamaran excursion or even just a taxi or bus to let them experience swimming in the clear blue water. My husband and I have already done the Tulum extreme excursion so that one is out. What is the best beach for this?