Hey here's the link to Hungry Valley:
Hungry Valley SVRA
It's a really great park with lots of variety for off road adventures (steep, easy, hard, rough, sandy, narrow-you name it). I can definitely see how this place would be incredible in the winter, with water crossings, mud and snow.
I was there for about 5 hours (it was hot!), but I managed to do about 30 miles of driving inside the park.
I took the FJ through some really fun trails including a large portion of the poweline trail. It was a great day in the dirt and I'll go up again anytime someone wants to meet up and go.
The park is only 15 minutes north of Pyramid lake right off the I-5. Super easy and convenient to get to from anywhere in LA and it's only $5 for a whole day of wheeling.
Also, it's $10 if you want to camp the night-which could be real fun if a bunch of us wanted to hook that up.
I'm uploading some videos to YouTube and as soon as they're loaded I'll post the links here.