Many hidden gems can be found on Abbot Kinney Blvd, aka "The Coolest Block in America" by GQ magazine. For example, GTA has a shady area around the corner where you can sit in the shade, eat, and watch the beautiful people pass by. Pic below taken from GTA's shady hideaway.
For a real hidden gem, you'll need to walk down a path to Another Kind of Sunrise. Where you will find homeade acai bowls, and the most amazing butter coffee.