Don from Ellisville, MO on 3/28/2013 11:39:02 AM:
Ben, there is no place to park at Machens. It's a deserted area in farm fields. Your best bet for what you are attempting, is to get a shuttle in St. Charles to the other end of the trail. When you ride back to St. Charles, you can then ride over to Machens and back (just to say you did the whole trail).
Most shops and inns are open starting next week.