An adventure that leaves you with a changed outlook. Specifically, traveling and taking risks (either physically or mentally) resulting in a memorable experience that provides for new knowledge or personal growth.
A: Our expedenture to Mexico was great! Spending time in a different country changed my life!
B: Like the time we got stuck out in the middle of nowhere and all we had was a 12-case of Tecate and a can of beans?
A: Oh yeah...