Ringtail Cat 10 mile loop through Eugene O'Neil National Historic Site is a 9.7 mile moderately trafficked loop trail located near San Ramon, CA that offers scenic views. The trail is rated as difficult offers a number of activity options. Dogs are also able to use this trail but must be kept on leash.
dogs on leash
From San Ramon, take Crow Canyon Rd towards Castro Valley, turning right on Bollinger Canyon Rd. Follow Bollinger Canyon Rd until you reach the Little Hills Ranch Recreational Area. Park at the small parking lot on the right. If you prefer, you can follow Bollinger Canyon Rd to the end and park at the Las Trampas Staging Area, which has a larger parking lot with portable toilets. Instead of starting on the Elderberry Trail, you will start directly on the Rocky Ridge Trail.