A Day with Mustsees Cancun & the Yucatan Morning - Stroll along the beach in Cancun to the Xcaret Terminal and jump on a bus heading south. Afternoon - Explore the underground river and bountiful reefs at Xcaret. Swim with dolphins or walk underwater on a "snuba" tour of the reef. Evening - Stay at Xcaret for the evening spectacular and return to Cancun for dinner and a night out. Or, continue to Tulum to see the Mayan ruins in the fading light, before putting on your dancing sandals for a local beach party.