Does such a thing exist? I try and do an activity for my birthday each year, and this year I was hoping that some friends and I could hit up a motocross track or something. I was wondering if there is anywhere you can organise to do this as an activity for a day, similar to go karting. I would need the place to provide bikes and gear, so a private course where you bring your own stuff won't suffice. Is there anywhere around the melbourne area that does something like this?