Perched on a cliff overlooking the Caribbean Sea, Tulum is thought to have been a major Mayan port. At this site, we'll visit the temple of the frescoes, the temple of the descending god, and "el Castillo," a temple on a cliff that offers splendid views of the coast. Then we'll journey to Xel-Ha, the perfect spot for snorkeling and relaxing. This natural aquarium is famous for its thousands of brightly colored tropical fish and dramatic limestone formations.