Bartolomé Island
Bartolomé Island has two visitor sites that are usually combined into one visit. The first is a swim and snorkel off a nice beach, around the iconic Pinnacle Rock; the underwater world there is really impressive. Snorkelers are in the water with the penguins, marine turtles white-tipped reef sharks, rays and other tropical fish. The second site is accessible via a long staircase leading up to a spectacular view point from which you can see the manifestations of recent volcanic activity.
Santiago Island, Sullivan Bay
While it doesn’t boast much wildlife, Sullivan Bay provides visitors with an opportunity to walk across a recent lava flow and examine its otherworldly beauty. Don’t worry; the lava isn’t hot, as it was formed in the late 19th century. The trail here crosses pahoehoe lava, dotted with pyroclastic cones. Inland, striking red and yellow tuft cones rise above the flow.