Isla Mujeres Trimaran Cruise. Cruise on a trimaran on the Carribben Sea to Isla Mujeres on this full-day sailing adventure from Cancun. Enjoy lunch and an open bar on this day trip to Isla Mujeres, the quaint, relaxed island that sits on the border of the Caribbean Sea and the Gulf of Mexico. Participate in aquatic activities like swimming and snorkeling on Isla Mujeres' stunning beaches and turquoise water. Book with us and Save 9%: Isla Mujeres Trimaran Cruise.