Nerd Tip
Whenever I fly out of an airport or park in an unfamiliar parking garage, I whip out my camera (or cell phone) and snap a picture showing the level, section, and spot number. No more worrying about where I parked the car when I return! This trick works great at trailheads where you want a map but forgot to bring one with you. There's usually a map there that you can photograph.
Bonus points if you weren't on this trip with me and know where this parking garage is.