Helicopter pilots are in constant danger of action stars climbing aboard their craft and throwing them out; kayakers, however, need only fear falling helicopter pilots. Steer an unstealable vessel with today's Groupon at Ripple Effect Ecotours in St. Augustine. Choose from two options:

• For $20, you get a single four-hour kayak rental (a $40 value).
For $22, you get a tandem four-hour kayak rental for two adults and one child weighing up to 65 lbs. (a $50 value).

Joining forces with Georgia Aquarium's Marineland Dolphin Adventure and the University of Florida's Whitney Lab for Marine Bioscience, Ripple Effect Ecotours launches intrepid kayakers on voyages through the town of Marineland's natural coastal habitat. For four hours, solo paddlers or a group of up to three can traverse the Guana Tolomato Matanzas National Estuarine Research Reserve's dolphin-laden waters, observing the aquatic residents and testing their alleged intelligence with science-fiction movie trivia. The estuary is located in the biologically diverse area where the Matanzas Inlet collides into the Pellicer Creek Stream. Home to the Jordan and Mellon Islands, the Princess Place Preserve, and the Pellicer Creek Aquatic Preserve, the estuary provides several spots to aimlessly explore the 500+ plant species and 300+ types of fish that call it home. Guests can prepare for adventures by loading sturdy kayaks with sunblock, binoculars, and water shoes.

Though not included in this Groupon, Ripple Effect Ecotours, which raises money and awareness for environmental education and preservation, leads guided tours through the Guana River, Anastasia State Park, the Faver-Dykes State Park, and the western section of Pellicer Creek. The instructors for the University of Florida Master Naturalist Program lead these two-hour tours, bestowing nautical knowledge on students, including tips on identifying aquatic plants, animals, birds.