The mission of the San Diego River Park Foundation is to improve the lives of everyone and everything involved with the San Diego River by creating the San Diego River Park. “The vision of the San Diego River Park is a greenbelt from the mountains to the ocean along the 52-mile-long San Diego River. This greenbelt is really a trail system and a clean and healthy river system which connects a diversity of parks, open spaces, public places and community facilities spread out along the length of the River.