I went down part of the Colorado River in a Kayak for over 2.5 hours with a party of others. The water was very shallow and full of water moccasin's. I got caught on a sandbank and at one point the boat tipped over, never been in a Kayak before, never again.
I Zip Lined over a tree canopy on one of the Caribbean Islands. When we got back to where we started their was a sheer drop back to our starting point. Each of us slid down a rope we were attached too which braked just before you hit the ground. Never again.
I snorkeled off a Caribbean island. We were close to the Clipper Sailboat we were travelling on. I looked down at one point to see a relatively large shark swimming way below. Not something I repeated.
Interesting but potentially dangerous experiences. I was surprised that I agreed to do them.