An adventure can be almost anything you want to do, but to me it means there always has to be some challenge to it. Do something for the first time, do further away, longer, higher with minimlal resources or anything like that.
An adventure is a personal thing. It can be something that is already been done by many people, like a marathon or hiking the Eifelsteig, but if it is a first for you then it is some form of adventure.
Doing something out of ordinary, something not in the comfort of you living room, but out there where anything might happen: that is an adventure.
Going out on a hike or a bike to me is a form of adventure that I want to explore more.
I am always making plans for more adventures and the ad of other people inspire me to try more.
Living the dream, living the adventures. Always.