The guided shuttle tour of the Garden takes an hour and includes a brief stop (10 minutes) at the glass houses. The tour guide, Faye, was friendly and cheerful and provided good information about the trees and plants as well as some local history. I debated taking the tour, as I planned to just walk, but having done the guided tour I would highly recommend it - great overview of the large grounds. Now I can return and walk the grounds with a clear sense of what I would like to see again.