From I-5, take Hwy 299 West, then Hwy 273 North (a.k.a. N. Market Street). After crossing over the Sacramento River take the first left/West on Quartz (road or street?). The skatepark is in the middle of the park. You can park on Delta St.
It is a 16,000 - 18,000 square foot community design built in 1998 for about $70,000.