Gardner Islet is formed by vertical cliffs that drop to sandy ledges and large boulders, creating a magical landscape both above and beneath the water surface. Snorkeling around the islet is a rewarding experience, as its usual to encounter the smallest of the Galapagos fish: garden eels, snake eels, blackspot morays, pufferfish, scorpionfish, and red-lipped batfish.
The area also has an abundance of other, larger fishes, including schools of snappers, creole fish, king angelfish, butterflyfish, jacks, large pufferfish and a variety of sea urchins and sea stars.