Take advantage of the beautiful Los Angeles fall weather and hike the Hollywood sign! There are several different trails / routes that will take you just behind the iconic 45 ft sign, so check out the attached website for a few tips and hit the route that best suites your speed!
Bike ride or walk along the Venice Boardwalk, where there is enough sand, sun, and CA hippies to keep you entertained all day. If you're in the neighborhood, don't miss the Venice canals (just a step below those of Italy), and Abbot Kinney for great shopping and restaurants.
Feel like a kid again, and be the ultimate tourist at the Santa Monica Pier.