MAJOR DISAPPOINTMENT!!! I read this was the site of the 1997-1999 world cup race, so I had high expectations of an awesome loop trail. First, the directions were not complete. If you come from Vallejo, turn RIGHT at the stoplight just after the state hospital, on Imola Street. Then go 1.5 miles and the park is on your right side. Second, it's $6 for your car and bike to get in. Now regarding the trails: expect major ascents/descents (most are around 20% grade). No rolling fast smooth singletrack here! From the parking lot you are going to climb to get to the center of the trails. If you don't take the main dirt fireroad up the hill, you mine as well shoot yourself right there because the trails are not well-maintained, and too rocky/steep to climb. For those hardcore downhillers you'll probably like the 3-4 gnarly downhills, but the uphills you'll be cursing. I will never ride here again, and I will never recommend it to anyone. The best trail they had was the main fireroad going up because it was at least rideable. Other than that, prepare yourself to get off and walk every 60 seconds. They also claimed to have water at the start, but it was so slow that it took me 5 minutes to fill up my camelback.