Questing - treasure hunts written in verse that leads to a log book and
stamps (mostly Northeast)
www.vitalcommunities.org
letterboxing - written in directions instead of clues
www.letterboxing.org
www.letterboxingcentral.com
geocaching
find the treasure with a GPS - take away a trinket as a prize - leave one
for another -
find coordinates on web sites and hunt
www.geocaching.com