Several months ago I noticed this small parking lot for the Santiago Creek Bike Trail on the map. Today i was finally in the area in person and had enough time and daylight to stop. It's a very small dirt lot, and it kind of sneaks up on you. Headed south on Cannon, keep an eye out for it after you go through the signal at Taft; it's just after the bridge over Santiago Creek. If you're headed north, you area able to make a legal left turn since the middle lane switches from a painted island to a 2-way left turn lane (with the solid yellow line on the outer edges and the broken yellow line on the inside edges) a couple hundred feet before the driveway. Or you can always turn around at Williamsburg to approach from the southbound lane. Cache is a 35mm film canister from a collection of containers that Nana to 4 gave me earlier today.