Need a list of natural ways to get high..?

I'm writing a song, and I need a list of suggestions on how to get high.. Doesn't necessarily have to be NATURAL, just not drugs or alcohol. For example.. running, skydiving naked from an aeroplane (got that from a song;) ), drinking coffee, going for a ride on a rollar coaster, making love, stuff like that. I need suggestions... help me out?