There is a whole network of trails you can ride. Be aware of soldier training and if there are it is recommended not to ride. Otherwise a sweet single track goldmine. I have rarely found its equal.
Go on the DuPont-Steilacoom highway past the firing ranges. There is a vehicle pull off on the nothern side of the road. Use access roads for access to the trails
http://www.singletracks.com/item.php?c=1&i=2699