How about:
bangle, bauble, gaud, gewgaw, novelty, fallal, chachka, tchotchke
The official geocaching definition of our hobby is this:
"Geocaching (v.)
A sport where one uses expensive global positioning technology to locate useless dollar store items in remote locations of the planet."
There are log books in each cache. Many people avoid trading items, but merely sign the log book to say they actually were there.
And there are caches for all levels of desire. I've seen (not actually found) caches hanging along verticle cliff faces, but most are hidden amongst trees in relatively simple areas.
I would consider it an addictive hobby.