I am a 30 year old researcher and musician from Canada.
I enjoy swimming immensely and do it indoors in the winter and in lakes and rivers in the summer. I used to be on my high school swim team. I also like biking and walking around. Being outside makes me very happy.
I am a sociable person but find it exhausting too, and so like alternating between highly stimulating times and quieter ones during which I like to read, nap, watch movies, listen to podcasts (especially Radiolab). I also do yoga.
I dislike sterility in most circumstances (perhaps hospitals are an exception....maybe) and so prefer staying in a house of some sort when I am traveling. I like to travel to refresh my perspective on my own life, and also to learn about a place and its people. These things are both nearly impossible if isolated in a hotel near the highway.
I just started using airbnb because of a recommendation from a friend who travels frequently. So far it has been a good experience.