Holiday lights + bikes. Do I need to say anymore?! It's a season when miracles happen and everyone is nice. For one night, the LA Department of Water and Power pair up with the Los Angeles County Bicycle Coalition to sponsor a night ride through the Holiday Light Festival located in Griffith Park. I think it's one of the hidden treasures of LA.
Here's a video I found from a few years back. Only in LA is it cold enough to remind you that it's winter but nice enough to still do a night ride. :)