Can't argue with the coastline, but you could hike up through San Gabriel valley. It's a steady ascent to the San Gabriel Mountains. You can tour the Huntington Library (fancy gardens/120 acres/museums) in Pasadena and walk down the Tournament of Roses Parade route on Colorado Blvd. (I hear you like walking).
So, do you not even use buses?
So, do you not even use buses?