Islas Marietas is a group of small islands located off the coast of Nayarit, Mexico. They are part of a national park and are known for their unique ecosystems, including diverse marine life and beautiful beaches. The islands are also famous for the hidden beach, or Playa del Amor, which is accessible only through a tunnel. The islands are a popular destination for eco-tourism, attracting visitors for activities like snorkeling, diving, and birdwatching. The surrounding waters are home to various species, including sea turtles and dolphins, making it a vibrant spot for nature enthusiasts.