Cozumel is the largest inhabited island in Mexico. Sample the little shops, bars and restaurants of San Miguel's colourful waterfront. Cozumel is a tropical paradise with lush scenery and is well known for its excellent beaches and watersports activities, such as snorkelling and diving, in the Dos Ojos cave system. Bird watching is another popular activity, as there are many species endemic to Cozumel and many others stop here on their migration routes. The Mayan ruins at nearby San Gervasio provide a worthwhile excursion for visitors interested in ancient civilisations. On the Mexican mainland, Chichen Itza is another fascinating Mayan ruin and one of the most impressive Mayan sites in the world.