$7 Parking Fee or Sonoma County Regional Parks Pass must be displayed on vehicle dash.
The milder uphill grade on the Arroyo Trail makes it easier than the Panorama Trail to get up the hill where all the sweeping views are. It's slightly shorter than taking the Ridge Trail too, making it the most convenient trail to get up to the top of the park. The one downside is if you're trying to run it soon after a decent rainstorm, Arroyo Trail appears to be one of the main gutters of the hills. So be prepared to either hop around or get your feet wet in the streams coming straight through the trail.