The Raccoon Marsh and Woody Pond Trails are part of the San Luis National Wildlife Refuge Complex in the San Joaquin Valley. They are the two trails open to the public in the West Bear Creek (north central) part of the refuge. The area is easily accessible from CA-165, just south of the community of Stevenson and the junction with CA-140.
The linked, short trails loop around marshy areas and provide opportunities for plant and animal viewing. You will see and walk through riparian woodlands, seasonal wetlands, and native grasslands.
The trails are wide and straight, and I am assuming are used as access roads for hunters and refuge personnel. Although CA-165 is audible and sometimes very visible from the trail, it's quite scenic and restful.
The refuge is not large, so it is quite doable to see other sectors in one day. If you want to see the Tule elk, head to the visitors center in the southern part of the park, near the town of Los Banos. There are two additional auto tour routes there, along with a handful of other short trails. To the east, off of CA-140, you can access the Kesterson Unit where you can free roam. Maps can be downloaded from the refuge's website or here is the overview.
Check out the Triplog.