Celebrate the city's charms with those who know it best: Angelenos. Public art activists LA Commons commision a day of free tours led by local musicians, artists and people who just love their neighborhoods. The third annual installment, "The River of Your Imagination," tackles one of LA's most misunderstood icons: the LA River. You can explore the unexpectedly beautiful Ballona Wetlands or learn the history of the massive mural, the Great Wall of Los Angeles. Make sure to check out the full list of locations; tours are free but require reservations.