31. Summit Rock loop.
This loop around Summit Rock, a popular rock-climbing site, provides spectacular views of the Santa Clara Valley.
WHERE: Sanborn County Park, east side State 35, 1 1/2 miles south of State 9.
DISTANCE: 2 3/4 miles.
DIFFICULTY: Easy.

32. Castle Rock.
A short stroll offers a close-up look at Castle Rock State Park's namesake, a Swiss cheese–like sandstone formation.
WHERE: Castle Rock State Park, west side State 35, 2 3/4 miles south of State 9. $5 day-use fee.
DISTANCE: 1 mile.
DIFFICULTY: Easy to moderate.

33. Saratoga Gap Trail and Ridge Trail.
Saratoga Gap Trail leads to an overlook above 80-foot-tall Castle Rock Falls, then heads west past sandstone formations and views of Monterey Bay. Loop back via Ridge Trail, passing the rock climbers' playground at Goat Rock.
WHERE: Castle Rock State Park, west side State 35, 2 3/4 miles south of State 9. $5 day-use fee.
DISTANCE: 4 3/4 miles.
DIFFICULTY: Moderate.

34. Indian Rock.
Watch rock climbers strut their stuff on Indian Rock, a sandstone formation with wide views of the South Bay.
WHERE: Sanborn County Park, east side State 35, 2 3/4 miles south of State 9.
DISTANCE: 1/2 mile.
DIFFICULTY: Easy.

35. Skyline Trail and Sanborn Trail
Follow Skyline Trail 1 3/4 miles to Sanborn Trail; bear right and hike 1/4 mile to Todd Creek for a picnic among the redwoods.
WHERE: Sanborn County Park; park on west side State 35, 4 1/2 miles south of State 9. Walk across State 35 to trailhead.
DISTANCE: 4 1/4 miles.
DIFFICULTY: Easy.