When I am in a place to do the "tourist" thing, I can google and garmin my way around. I really don't need a friend for that.
What a tour guide-friend is for is the things that aren't in the typical tourist brochure. Those cool little places that are "undiscovered". So not just a beach, but that odd little secluded one where you hike down a near cliff to deserted sand and perfect waves - THAT beach.
I want my friends to take me to the places THEY think are cool.
angela