Details of this geocache trail can be found at the first cache.
You are looking for a medium tube.
I've check the co-ordinates for this one, but some hunters have said that they seem out - and I would agree that cache appears in the wrong place on google maps. I've upped the hint a little.
This series is being made open to all again (rather than premium only) - but caches will be archived as they get damaged or go missing, and the series will eventually be retired. Please look after the caches to preserve them as long as possible, and happy hunting!