Third grade students venture on a two-day trip to Walker Creek in West Marin. Naturalists lead them on short nature hikes to study garden, pond, creek, and bay forest ecosystems. The 4th grade spends three days at Coloma Outdoor Discovery School, near an historic mining town, complementing their study of California history. Fifth graders camp for three days at Big Sur, where they explore both the forest and the seashore. Sixth grade students camp at Pinnacles National Monument for four days, rock climbing and discovering the area's geology and ecosystems. The 7th grade spends five days in Yosemite, which presents them with the challenges of wilderness backpacking. In 8th grade, students travel to Oregon for a week-long white water river rafting trip down the Deschutes River.