If you don't want to pay the 6$ for parking at the campsite, you can drive north up 79 about another 5 miles to the parking area by Lake Cuyamaca. Parking is free until 8 pm.
Cross 79 and walk up Milk Ranch Road (Fire Road) to Azalea Springs Fire Road, follow Azalea Springs up to Conejos Trail which will lead you to the summit of Cuyamaca Peak. This trail is about 3.5 miles altogther.
Personally I like it better than walking the paved trail from the campsite. It's a little more secluded and quiet... Injoy...