Isla Mujeres is a small island just 12 miles outside of downtown Cancún across the Bahia de Mujeres. It features beautiful white-sand beaches for lounging, calm waters for swimming or snorkeling, and a peaceful atmosphere thanks to the laid-back locals. This small four-mile-long island will take you back in time. If you are looking for a day of laid-back exploring, add Isla Mujeres to your schedule.