Plan the perfect marine day to Mexico’s beaches with these island excursions, marine life and beach activities from Cancun! Head to beautiful Isla Mujeres by catamaran or Holbox Island for a fun day of snorkeling and beachside relaxation. For the adventurous ones, don’t miss out on the marine life encounters such as a snorkeling trip with Marine turtles and whale sharks on this day trip from Cancun. Don't forget to explore a wide variety of water activities and discover archaeological ruins.