Does anybody know of a good resource(s) to help with organizing a "race" between two teams from different location's to a common point. Or even two teams competing along a similar track but starting in opposite directions. This would be a combination of ATV and hiking with different "challenges" at several points which must be solved/completed to find the next location. Looking to do a 2 to 3 hour challenge. I need a book/link/publication/forum etc. that could give me ideas for challenges (puzzles, orientering (sp?), etc.) to create a smooth and fun team building experience for two teams of 6.