Gravity Trails gives visitors adventurous ways to explore the outdoors with ziplines, kayak tours, and bike rentals. The company's portable zipline can be set up at virtually any location and stretch from 100 to 300 feet, giving groups and get-togethers a heart-pounding way to explore a favorite park, take in the coastal scenery, or careen through the mall for some very last-minute shopping. For a more leisurely outing, two-hour swamp tours let customers get up close to one of these areas the native flora and fauna of Cane Bayou, Pearl River, Honey Island, and Jean Lafitte National Historical Park and Preserve amid the silent ripples of a kayak. Tourists sans transportation will especially rejoice in Gravity Trails' bike-rental program, which delivers gleaming cruiser bikes directly to customers' doors for as little as four hours and as long as a week.