Marietas Islands and Hidden Beach Tour from Puerto Vallarta

This small-group boat trip from Puerto Vallarta goes to the Marietas Islands in Banderas Bay, an ecologically diverse sanctuary that includes a hidden beach out of sight from the water. The listing gives about three and a half hours. The operator says the boat is comfortable and the group is small, and mentions a walk on the beach known as Lover's Beach.

In the water, you swim through cave formations and rock archways, looking at the terrain and at more than 100 species of birds and fish that live on the islands. Snorkel equipment is included, along with snacks and purified water.

On the way back, watch for wild dolphins jumping out of the water. The operator says the small boat lets you see them from a sea-level perspective. Wildlife sightings are never guaranteed, and the listing also warns that beach access depends on sea conditions and is not guaranteed.

The trip has strict conditions. The minimum age is 12, and minors must bring photo ID with a date of birth. Drones are prohibited, due to federal regulations protecting the flight path of endemic birds. Mexico's federal ports enforce a no-drug policy that includes e-cigarettes and vapers, and no refund or change of day is offered to guests denied access. Passengers arriving on a cruise ship cannot book this tour.

Bring a bathing suit, shorts, a sun hat, sunscreen and a towel. A high level of physical fitness is expected, and the tour is not recommended for pregnant travelers or travelers with spinal injuries or poor cardiovascular health. People with heart disease or back, spine or knee problems cannot take part. Hotel pickup and drop-off, gratuities, port fees, government fees and the access fee are not included.