Most of the park is rugged. Plant life hides much of the park''s geology, which is principally volcanic, but you can see a reminder of the area''s violent geologic past in the volcanic ash cliffs of upper Ritchey Canyon.

The park is home to raccoons, gray squirrels, deer, foxes, bobcats, and coyotes to name a few, but they are sometimes difficult to spot because of their nocturnal habits and the heavy forest cover. Several species of birds can be easily detected though, including the six kinds of woodpecker that inhabit the park. The spectacular crow-sized pileated woodpecker is one of them. On a more rare occasion a spotted owl can be found, perched high in a redwood tree.

Located by the entrance to the park is the visitor center, which has displays, brochures and sale items. Brochures (hiking maps) are also available at the entrance station. Next to the park''s visitor center is the Native American Garden which displays some of the plants important to the first people of this area. Today, many of the same plants are used by the Wappo people. A guide for the garden is available by mail or in the visitor center to broaden one''s understanding of the first people.

Near the day use/picnic area is the Pioneer Cemetery, resting-place of some of the original settlers of the Napa Valley. The cemetery is an interesting place to visit while on a day hike, and is currently under restoration to return it to its original, mid-1800s appearance.

Interpretive programs are offered throughout the year. Most of the programs including morning walks and evening campfires are scheduled in the summer. For exact scheduling check the park''s bulletin boards. Special programs can be arranged for groups by calling the park.