A very popular destination is Mendenhall Glacier. A bridge connects Douglas Island with the rest of Juneau, and there are about five places where roads end. Float planes and helicopters offer glacier tours in summer. Dog sled rides are often given to tourists landing on the glaciers or ice caps. Other companies offer boat rides. One of the signature places in Juneau is The Mount Roberts Tramway, an aerial tramway stretching from a station on the cruise ship docks to a point on the southwestern ridge of Mount Roberts.