I/we love to combine geocaching with our camping. Before every trip I look for interesting caches. Finding hidden historic places are our favorites.
Our geocaching profile makes it easy to see where we have been. Many finds in the Gold country, Big Bear Lake, Anza Borrego desert, Valley of Fire, even Yosemite (where there are quite a few "virtual" caches").
We use a Garmin Oregon that can hike, be mounted on our bikes, or even on our dual sport motorcycle.
Not many interesting near home in Los Angeles, but fun none the less.
Oh, and we have hidden one cache near home on a quiet maintenance road near Marina Del Rey wet lands.