Holy cow, I wrote a book!
Geocaching is sort of like
global hide-and-seek (with hints) for technology geeks.
I stumbled upon a non-GPS version of this diversion,
(not to be confused with
movies, another subject entirely).
By the way, if geocaching isn't enough "fun with a GPS" for you,
you can try
The Degree Confluence Project.
See the world with a GPS, experience other cultures, learn a few
words of the local language:
The Thais kept asking how many farang (foreigners)
did this and how much they got paid.
I must have heard the phrase "farang Baar",
(foreigners are crazy) more than a couple of times that evening.