The Tuolumne River Regional Park in Modesto, CA is a great place for people of all ages to enjoy the outdoors and get some exercise. The park has over fifty miles of trails and paths that can be used for biking, hiking, and running. There are also two large lakes with fishing available on site! If you're looking for a new adventure this summer then come visit the Tuolumne River Regional Park in Modesto CA! Tuolumne River Regional Park in Modesto, CA is a great place to go for family picnics or just a day of fun. There are several trails, playgrounds and spots by the river to sit down and relax while enjoying nature's beauty. Learn more here.