The Humbug-Willow Creek Trail is really a collection of multi-use trails in the city of Folsom, about 32 miles' worth, and more are planned. The trails snake throughout the city, between Folsom Lake in the north and Alder Creek in the south and between Lake Natoma in the west and Empire Ranch Road in the east. Some of the trails follow along Humbug Creek and Willow Creek, hence the name.
Also included in the Folsom Trail system is the Folsom Parkway Rail Trail
The Humbug-Willow Creek Trails are accessible from numerous places throughout the city.