There are a few steps involved in finding this cache:
1) Solve the puzzle below, using the clues given and entering
each one horizontally in the grid. Eight of the answers are 9
letters long, while one is eight letters and an exclamation point.
The clues are not necessarily next to the line where they should be
entered.
2) Take the letters from the numbered squares, in order, and
substitute the LDAP value. (last digit alphabetical position - see
table below) This will give you the trailhead coordinates, which
can be checked with the
Geochecker.
3) Near the trailhead, you will find one last set of
instructions (in the obvious place!) to modify your completed grid,
part of which will again involve using the LDAP approach. This will
yield you the final cache coordinates.