walking from parking to great wall

hi! were going to visit the wall on dec 27. can we ride the gondola to the wall? how far we have to walk from the parking are to the gondola service.. and from gondola to the great wall itself? i understand it winter in china on that date, and we have our kids with us age 9 & 10.. just wondering how we can save more walking for the kids not to easily get tired from going to the wall.. thank you