A swimming lagoon with lifeguards is open during the summer months. Both parks offer boat rental during the summer months. Camping information for Spring Lake Park Spring Lake Annadel State Park is an undeveloped park of 5,000 acres, with 35 miles of trails inviting hikers, horse riders and mountain bikers. The park includes open meadows, mixed woodlands and Redwood forest. Lake Ilsanjo is a small lake in the park.
Fishing is permitted.
Annadel State Park is often referred to as an urban wilderness. The feature that stands out most is the park's variety. One can walk in cool shaded forests, then into mixed oaks, onto expansive meadows, around a lake's shore, through tangled chaparral, and return to forest coolness in the space of only a few miles. Historically, quarrying was the most important human activity in the park from both the Native American and European standpoint. Deposits of obsidian may have been used by Pomo and Wappo tribes for more than 3,000 years before Europeans entered the land.