The cache is located in the valley section of the San Marcos Preserve.
There is poison oak about so be careful, but you should have no problem reaching the cache without having to walk through any.
Your looking for a small plactic container just off the trail.
The orignial contents include a log and some swag recovered by from GeoBigDogs archived caches.
I forgot to put a pen in it so bring your own pen. (When I get a chance I will put a pen in it.)