Take a walk around Gumbo Limbo and learn how to save the sea turtles.
Two of the locations are under cover and you may need to move into the sun to get the question to appear and then move back to the informational poster to provide the answer. I tried to make the zones quite large so you can go back and forth if need be. The cartridge will take you in a small circle upstairs and then back down again.
The final zone will take you to the cache after you answered the last question but you can take plenty of time to explore the exhibits and walk the trails and go get the cache whenever you want.
Permission to hide the cache in the specific location it is in was given by Susan Elliot, Program Coordinator. It must be replaced exactly where you found it and covered so it is not visible. Do not leave the trail, you can retrieve the cache from the trail.
If the unlock code does not work try entering only the 1st 15 digits. I do not know what the unlock code does but that is something I found on the groundspeak forums.