The lower section features a great 8 mile bike path with a nice hill in the back. There's a connected ride with a section of the L.A. River which can extend the ride another 10 miles or so. If you're feeling like a nice long climb, you can go up Vermont to the Observatory, it's a nice 2 mile climb. Don't bother going on weekend afternoons for any reason, picnicers tend to treat the park like their personal garbage can, it gets pretty trashed, nasty. They do a good job of cleaning overnight though.
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