Yup, loved Mayfield! I'm not athletic or terribly coordinated and not in great shape. The guide held my hand to steady me in certain places. The hardest part was the climb up the hill to the road at the end.
Private guides do work for tips only and were great. I would plan on at least $20 as they're with you for a couple of hours.
It is beautiful, refreshing, natural and the lunch they serve is awesome!