Yep Dobbo, your right about the weather, I live just outside Penrith and was praying for a drier day today without the crazy gale force winds.
Bike route, started out on the first small bit of blue, turn left at the bottom on the fire road, up to the Red North singletrack climb, then round the full north loop. After the last descent we then climbed back up on the green walking trail and descending back to the visitors centre on a mixture of footpaths and fire roads, ending with riding the red start backwards. Not sure of distance but it hurt!