This was a regular cache, but it was plundered twice within a week at different locations, so it's now it's a micro and magnetic. Too many geomuggles around I guess.
The biggest challenge to this cache is finding a way in! For a greater challenge, try this one without a map.
For a nice, easy bike ride, start out at N37'23.891 W121'59.259 and take the entire length of the Greenbelt to the cache.
You can read more about the John W. Christian Greenbelt at The Sunnyvale Sun.