There are two groups of caches in the series that can be accessed from the Parking Waypoint:
1. GC4YMR0, GC4FX18, GC4P80C, GC4FX4Z, GC4FX6N, GC4P69D, GC551CR, GC551EZ, GC551GT
NB: It is best to return to the track after each cache.
2. GC4FX6A, GC4FMVT
NB: There is a bit of a hike for these 2 ... and potentially a creek crossing.
It is best to return almost to the Parking Waypoint after doing the first group rather than attempting to go directly between GC4FX6N and GC4FMVT.
There are also some other accessible caches in this area.
The Gnome Hunters
This series pays tribute to cachers who have completed the Serpentine Gnomes series and celebrates some of the great logs written by said Gnome Hunters.
Luna Maya
Luna Maya on The Guardian Gnome: "Oh my Oh my, an end to a perfect day. Our legs are like jelly, but like magic the rain is falling lightly to cool us down. We loved the cache & feel it got its just rewards ! After finishing this series we visited the Serpentine Tavern for a beer, what a cool place!".
You wrote terrific logs on all of the gnomes Luna Maya ... and the Serpy Tavern certainly sounds like a great watering hole for tired gnome hunters!
The Cache
This cache involves a bit of a climb and potentially (but not necessarily) a serious bush-bash ... what would be the best way into and out of this one?
Enjoy the climb. 
It's an ammo box. And there's a cairn.