The Terre et Eau (Earth and Water) letterbox was planted two weeks ago by
three young cousins (C, W & M) from opposite ends of the country, with help
from mom/aunt TurtleMcQ. The box takes its name from a phonetic version of
the cousins' shared French-Canadian ancestral surname.

Orange County is that heavenly land south of LA and north of San Diego.
Canyon Community Park in Costa Mesa, where the clues begin, merges into the
Talbert Nature Preserve which extends to the Santa Ana River bike trail.

You can find the clues here:

http://www.letterboxing.info/box_terreeteau.shtml

TurtleMcQ
P8F17X6

http://www.letterboxing.info/turtlemcq.shtml