Well, there is activity on either side of Arizona, in
both New Mexico (Albuquerque) and southern California.
(The hunts from the Los Angeles area sometimes end up
in Arizona, though, even on 2m.)
Otherwise, you may have to start your own hunt and
invite others. Keep it simple for beginners. 2m is
good because almost everyone has a HT, though in some
areas 70cm is also very common.
I've had good results introducing transmitter hunting
at a club picnic, hamfest, or other gathering.
A transmitter at about 20mW allows body shielding using
an unmodified HT to get close enough to find it in
most cases, while still copyable to a couple hundred
yards. We've had 16 or more hunts during a picnic -
the first one to find it got to hide it the next time.
Put transmitter, ID'er, and battery inside a box (I used
an old paint can) so it is self-contained and reliable.
We even had kids from neighboring picnics want to join
in the fun.
If you start a mobile hunt, don't make the hunts too
difficult! An automated transmitter is nice, but one
person reading the club newsletter into an HT will
work for starters. I suggest people start with a
2 elememt quad and an "offset" or "active" attenuator.
You may want to build several so you can loan them to
people to get them started.
Talking about the hunt afterwards on the repeater and
writing an article for the local club newsletter will
help to get others interested.
Good luck, and happy hunting!
- Dale WB6BYU