Thank-you for all the positive feedback! After reading the comments I
realized a third criteria was needed for an Octopus letterbox,
Environmental Impact. Some people thought I was suggesting "turn over
every rock" to find the letterbox or clue. An ideal placement would
have no environmental impact. The clues would lead you straight to the
letterbox.

The new criteria for an Octopus letterbox:

1. The clues refer to an area, not the exact route to the letterbox.
Clues (or additional letterboxes) are planted, in the defined area, to
lead people to the main letterbox.
2. The area is well defined.
3. Environmental impact. (none if possible) Another usual statement
here would be "Do not leave the trails until a clue tells you where to
go."

This placement is ideal for small areas. It can be used in larger
parks by making the defined area smaller; example, "look for clues on
the Acorn Trail" or "Look for clues within 75 feet of Round Pond".

Several other comments compared the "Octopus" type LB to Geocaching. I
don't Geocach, so I am not sure what they are referring to. If they
meant having a series of clues planted, then - "Good", that is one way
to do it. If they meant a random search in a 30 or 40 foot diameter
circle somewhere, that is not at all what I meant.

I am now planning one set of three Lbs for my first Octopus, with a
rhyme giving clues. Each of the three, will have clues to help with the
others.

For a second Octopus LB I am planning the main clue will be: "Go to the
Indian Grinding Stone". (Octopus clue, since they may have to search
the park to find it.) For people who don't know the park, (or don't
want to spend a lot of time there) I will post additional clues online
(here?) and at my other letterboxes.

While it is usually much quicker & easier to write clues for the
Octopus type, it can also require more work. I searched an entire park
for twenty foot cliffs, to use as Octopus sites, but there was only one
such cliff & it had a geocache there already. Usually the Octopus
requires less effort. On my first difficult placement, I think the long
directions took over 4 hours to write, check & recheck. Octopus clues
are very easy to write.

Thanks again,
Morgun