G.I.s.H.W.H.e.S. (which stands for the Greatest International Scavenger Hunt the World Has Ever Seen) is a 5-time Guinness World Record breaking scavenger hunt hosted by Misha Collins that you can compete in from anywhere in the world (even from your own home!).
"A transformative work takes something extant and turns it into something with a new purpose, sensibility, or mode of expression. Transformative works include but are not limited to fanfiction, real person fiction, fan vids, and fan art."