Runyon Canyon is a very popular urban park in Hollywood with a moderate 3 mile hiking loop.
There are great views over the city from the trail. Here is a view looking out over Hollywood toward downtown Los Angeles:
Cactus and Palm tree near the Fuller street entrance to the park:
The main entrance to Runyon Canyon is on N. Fuller Ave. one block north of Hillside Avenue. There are additional entrances on Vista St. and from the north on Mulholland. Dogs are allowed on the trails.
View Runyon Canyon in a larger map