Sky Dived. I sat on the edge of the grand canyon - not all that adventurous but was scary trying to get close without falling over the edge haha.
Not classed as adventurous but I also have been parasailing in Bali, Quad Biking in the Valley of Fire in the US, Swam in waters from a Volcano, Snorkelling in Nth Bali, I ventured to the wrong side of Venice beach Cali and was one of two only white girls on a bus in downtown LA, whilst two guys were threatening to pop each other over the lack of space in the bus. Aw yeah!
I wanted to do the Sky Jump off the Stratosphere Tower in Vegas but my friend is afraid of heights so I passed as I didn't want to make her wait around for me.