Spend your second day in Walnut Creek exploring the great outdoors. Start your morning with a hike in the beautiful Shell Ridge Open Space, offering scenic trails and panoramic views of the surrounding hills. Afterward, head to the Lindsay Wildlife Experience, a unique wildlife rehabilitation and education center, where you can learn about local wildlife and even meet some of the resident animals. In the afternoon, rent a bike and ride along the Iron Horse Regional Trail, a paved path that stretches for miles and connects Walnut Creek to other nearby cities. End your day with a picnic at Heather Farm Park, a sprawling park with a lake, gardens, and sports fields.