There are multiple Volunteer trail maintenance and park beautification opportunities at Mission Trails Regional Park. Review specific project opportunities at the Mission Trails Regional Park website, at MTRP.org. Go to the "Contact" tab and click on "Volunteer"...the various trail maintenance projects are listed on the second page. For convenience, the current volunteer project page may be reached here:

https://mtrp.org/wp-content/uploads/2018/02/Volunteer-Flyer-2.pdf

For the trail maintenance projects, there is no need to sign up or contact the ranger ahead of time, you can simply go to the project, with the recommended supplies/attire and you can sign the waiver at that time and begin work. There is no ongoing commitment required, simply come when you are available. If you have questions about a specific opportunity, you may contact the assigned ranger.