The Colorado River
The Colorado River (depending on what activities you choose to partake in there) is an incredibly dangerous place to visit. White water rafting is a very common activity there, which is when you and your closest friends hire a guide to take you through the rapids in an inflatable boat. This activity has the potential to be deadly, as the rapids can unpredictably be impossible to navigate properly, and if you fall out of the boat, the current is strong enough to hold you underwater even with a life jacket on.