Crystal clear waters of the Caribbean in Tulum, Mexico. Originally known as Zamá (meaning "the place of the rising sun" in the old Mayan language), Tulum was once one of the most important religious and cultural centers of the ancient Mayan civilization in Mexico. These days, it is a very popular tourist spot as the place offers a unique combination of impressive ancient Mayan ruins and breathtaking beaches with stunningly turquoise water.
I am missing the ocean right now looking at your pic. Looks amazing!