I hate to 'poo poo' your idea but I just don't see it taking off, why on earth would I want to do this kind of thing when there are really great caches in Supermarket car parks that I can do while getting my shopping ? Walking, pah, it'll never take off. Why WALK to a cache when you can simply open your car door ? I just don't get it, maybe you can explain it to me.
I'm currently working on a large series of nano's and film pots hidden on the roads around busy urban areas in Lancashire, that hopefully will entice more people to get out in their cars into the great outdoors where they may occasionally see great things such as Tesco, Asda, and McDonalds, further along in the wild you may also get to see awful things like grass and trees, but I will be keeping these to a bare minimum, as far as I can see what you are trying to do who will only redicule my efforts, so with much regret I'm afraid I cannot support this series although I wish you well in your (somewhat foolhardy) venture.
Regards
Pete