A county park that bisects the peninsula south of the main city, San Bruno mountain is accessible by car and has loads of walking and biking trails. The Saddle Trail goes through woods and leads to fantastic views of the city.
It's particularly convenient for the airport, which is why if you've got a couple of hours to kill before or after a flight it's a great antidote to the stress of air travel. Parking is $5.
Guadalupe Canyon Parkway;
For directions see www.co.sanmateo.ca.us/smc/department/home/0,,5556687_12313315_12345092,00.html#Directions
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