FB5, for you the best way to get to Flaming Geyser is I-5 North, take exit 142 (Hwy 18) going EAST bound towards Auburn, take the Auburn-Black Diamond exit off of Hwy 18. Follow the signs to the park. The park is eight miles from Hwy 18 on Green Valley Road. Be lookin' for the park entrance on the right side of the road or you will drive right by the entrance! When you enter the park you pass over a bridge that is over the Green. Look to your left and you will see the parking area and probably see fisherman wading in the river.
It will be a long drive for ya but if the weather cooperates fishing for Chums will be worth while all the way to the end of the season for salmon Dec 31st.

P.S. If you are serious about hitting the Green I would be more than happy to show you around!