Roxborough State Park
This beautiful park near Denver is a designated National Natural Landmark. “The park, with close to 4000-acres, is filled with dramatic red-rock formations, distinct plant communities, and a host of wildlife ranging from black bears to mule deer.” There are accessible restrooms and a visitor center. The park is day use only. Phone 303-973-3959 Here is the park website. Trails Brochure and Trail Map
? The Fountain Valley Trail is basically a 2.3 mile dirt road and can be wheelchair accessible with assistance during dry seasons. There may be some erosion in places, so be sure to call ahead. It does not qualify for ADA designation.
You can ride this trail in the “Roxborough Ride”, a golf cart seating 6 guests and a volunteer driver/naturalist guide. Although the Ride is free, donations are requested. Each disabled person must be accompanied by an able person to help them on and off the cart. The ride is usually scheduled for Saturdays and Sundays and reservations are wise. Call the park, 303-973-3959, for more information.
Although the shorter Willow Creek trail is not wheelchair accessible, I have done it with a walker. Roxborough is truly beautiful and surprisingly peaceful, given its proximity to Denver.