- who have a portable GPS receiver
- who can calculate MD5 signatures (or don't mind using a website where someone has done it for them)
- who appreciate spontaneous adventures (ranging from the mildest of sunday drives to treks and climbs through wilderness)
You may appreciate GeoHashing - a process of generating essentially random locations on a daily basis within relatively easy reach of the adventurer. There's also the potential for meeting up with like-minded adventurers at the location, if that's your thing.
This page actually uses "Web 2.0" (am I actually saying that?) technology to generate the coordinates for you (if you don't know an MD5 from a MP3) and display it on a map (a printed map doesn't require an unobstructed view of the sky). That would almost seem to make it too easy, but I would expect the interesting part of the spontaneous adventure begins as you step out the door, not as you're planning your route. Both important, to be sure, but anything to make it easier to get out the door is a good thing.
All that said, the location for my graticule is not too far from work - and not at all far out of the way to and from a perfectly good fish and chips place that I haven't gone to for lunch in a while. So, I'm planning to detour a little bit on my way back to the office this afternoon.