Has anyone out there placed any letterboxes that might require the
hunter to have some type of special skills. An example might be one
that required rock climbing skills and equipment. If such boxes do
exist, I would think they must obviously be clearly identified in the
clue and instructions only for trained individuals to attempt them.

Personally I have never done any rock climbing and don't really have
any interest in that particular sport. However, I always been
somewhat of a monkey in the trees since I was a kid. I recently
discovered a recreational tree climbing sport (www.treeclimbing.com)
that uses much of the same approach and equipment that rock climbing
does but claims to be much safer (no serious injuries in 13 years of
the sport by persons with adequate traing and equipment). I expect I
will try to get trained sometime this year if possible. I was toying
with the idea of placing a box or two way up in the top of some
trees. However, ultimately I probably will not do it just because of
concerns about being sued (regardless of disclaimers) if some
untrained bozo were to attempt it without adequate equipment and get
hurt.
--
Regards,

Eric Mings Ph.D.