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This is the Nicholas Flats\Gokite Beach Trail in Malibu. Its an up and down ride and you will climb 1700 feet in a little over 2 miles so its pretty steep. You might want to bring some food to get your energy level back up for the downhill! Coming down is really fun and it gets faster and smoother the closer you get to the bottom.
Trail Location
https://www.trailforks.com/trails/gokite-beach-151966/