The park is home to 978 acres of marshland and rolling grassland covered hills. It is popular for walking, bicycling and bird watching. Bicyclists can ride on the 3.5-mile paved Bayview Trail that connects with 12 more miles of trail along the south levee of the Alameda Creek Trail.
This preserve has trails that go straight up from sea level to the 2500 foot Mission Peak or to other nearby peaks. There are a total of 29 miles of trails and 3000 acres with views of the North, South and West Bay. The trails have very little shade so bring water with you. Most of the trails are very wide and you share them with bicycles, horses, hikers, runners and dogs. There are many cattle grazing near the paths. This park is very popular so if the parking lot is full, you can park on Vineyard Ave. There are restrooms at the entrance to the trail.
This park contains four bodies of water: Horseshoe Lake, Rainbow Lake, Willow Slough and Lago Los Osos. There are many paved trails open to pedestrians and bicycles that surround the water as well as Alameda Creek trail that moves alongside the park.