For those of you who have been following my 40+ zoo/aquarium summer road trip, you will know that I have mentioned Adventure Courses/Zip Lines on a couple of occasions. Yesterday at St. Augustine Alligator Farm Zoological Park (that is a long name!) I saw many visitors sign up and fork over $40 each to tackle the obstacle course that can take up to 2 hours to complete. At Brevard Zoo today I also saw large groups of people paying $48 each for the 3-hour course that comes with a zip line experience directly over a crocodile swamp. I suspect that perhaps a dozen zoos across America have these type of attractions and my general impression is that they rake in the dollars as there is little maintenance and they are expensive for visitors.