Want a big downhill? Lake mountain to Marysville should work nicely. Mostly 2WD or 4WD track, the route descends through the upper rain forests of the Great Dividing Range crossing the Taggerty river several times in the process. Flat out, this route will take 90 mins or so, but there are several options to take a walk into the rain forest, or just stop and enjoy the view of the Acheron Valley. The route isn't technically demanding but does have a few climbs and does require some fitness.