new to blue mountians new help

Hi
Can anyone give some advise on a day trip down the blue mountians.
What I would like to do is get a train up the blue mountians with a couple of friends and spend the day biking.
The plan was to drive to a hotel at the base of the blue mountians or somewher along the way, put the bikes on at train with us and start some where up the mountians. We then want to stay in a hotel where we started from for the night and have dinner and a few drinks. Any advise would be greatly appriciated.
Cheers,
Kevin