>>6are you talking about going wardriving? (or warcycling, in the case of a bike) I've always thought that sounded like a fun time, but I'm not passionate enough about networking or radio to find entertainment in the process of data collection or doing things with it.
I think it'd be pretty neat to go wardriving with an SDR and look for more esoteric radio transmissions, hopefully some unprotected stuff to snoop in on. You'd get to see what sort of things people around the area are using radio for beyond straightforward networking.