Good morning NiraD,
I read your bio and you seem like an accomplished fellow, do you think a cash based series with geo coordinates combined with puzzles to solve would be interesting to the geocaching community? Nothing like cash to get the juices stirring! I know it would fun for me, kinda like a treasure hunt with a real treasure. As I mentioned to Keystone if you would like to advise I would welcome the assistance!
My main concern would be people rushing like crazy to solve the series...don't want people to drive carelessly pursuing the treasure, I think the puzzle component could be used to slow people down