Cave Point Park
If you thought Wisconsin was all about cheese, and not so much about aquatic extreme sporting, you are only partially correct. The limestone cliffs and caves that pepper Door County have long been a veritable playground for outdoor adventurers—even if some decide to stay inside their kayaks. To be fair, they probably have some cheddar stashed in there. I wouldn't leave either.
Officially the southernmost point in the US, Ka Lae is another premier example of our 50th state's lofty stature in the cliff jumping arena. Using Hawaii almost seems like cheating, considering it's tropical location, but watch this video and just try to argue against its inclusion. Expect drops up to 75 feet, and even a built-in ladder to help you climb back to the top.