We are off to Europe and Iceland in two days. (We're so excited!) We booked the Golden Circle Express tour for next weekend and we're wondering what to wear. Are runners/sneakers an absolute must wear item or are flat shoes appropriate? I want to pack as little as possible, and do not want to pack runners unless I definitely need to for the tour. It is unclear how much walking on rough terrain is involved and any input would be greatly appreciated.
Thank you very much!