Los Angeles: Runyon Canyon
Los Angeles isn't all artificial. Get back to nature with a hike on the three-mile Runyon Canyon Loop. You won't feel completely untethered from Hollywood (that massive sign is in full view at the summit) and its not quite a mountain (it's really the tallest of the Hollywood Hills), but it's a great walk and a classic L.A. experience. Bring a small dog and you'll fit right in.