The vast majority of the park is undeveloped, except for the trail system, which takes in numerous natural features and ecological habitats. “The beautiful thing about the course is that it drains really well,” Paul said. June 22nd, 2002 I went to Skyline Wilderness Park in Napa CA. Popular with equestrians, be on the look out and keep it friendly. Wide fire road has several technical areas gradually rising to Lake Marie, 7% average grade (819’ elevation). Skyline Wilderness Park is a one-of-a kind public park and an invaluable resource for the Napa County community. If … Park Facilities: Patches of open grasslands are also found at various locations elsewhere in the park. The hike was long but not to strenuous on the main Lake Marie trail. In 1998, a disc golf club began working with the park to set up a range. “We measure holes in feet instead of yards,” said Paul, who estimates Skyline’s course to be about 5,500 feet long.