I'm thinking of running a trip that has one day of driving around Marysville, one night camping at Cooks Mill Campground or Andersons Mill, then a 1/2 day of riding at Buxton MTB Park. I'd be keen to ride the first day but we'd need showers after so... you'd have to jump in the river.
Let me know expressions of interest and refer to a friend if you think they'd be interested.