Las Grietas Expedition
Hike through enormous cacti and over the lava rock formations to one of the most unique swimming holes on the planet. Las Grietas, which translates literally to mean "the cracks," is a geologic formation unique to volcanic islands. This deep brackish canal forms between the steep lava rock cliffs on either side. Float blissfully in the cool water -- or get your adrenaline pumping by jumping from the rock ledges.
Time required: half day
Activity level: moderate or vigorous
Location: Santa Cruz