Try geocaching; it's basically a high-tech treasure hunt. Lots of fun.
My boyfriend did a treasure hunt for me last Valentines day, I don't remember the clues, but they were mostly just goofy rhymes that had personal meaning for us. For example one time he knocked my hairbrush off of a shelf and broke it...one of my clu...
I've created a treasure hunt complete with homemade map and a treasure chest full of goodies. I'm giving him the map, in a bottle, before college on v-day and letting him drive us both back to my house after, where he will begin his little treasure h...