This 11.5km trail drops steeply into Sailors Gully along an old 4WD track. The trail then levels out along the scenic Collie River (which is well worth a look - and maybe a swim) before the single track climb back up the Mill Brook drainage.
A good level of fitness and lots of water is advised for this longer loop.
Tips: The trail is only sign-posted for the clockwise circuit. However it is possible to ride the trail in either direction and if you like downhills then riding it anti-clockwise; descending the steeper singletrack Millbrook Gully and climbing the more gentle doubletrack Sailors Gully is likely to be more fun.