Taxis may be plentiful on the Northern Mariana Islands, especially Saipan, but they are also expensive and only permitted to travel between hotels, Saipan International Airport, and DFS Galleria Saipan. Cruise ships, yachts, and military vessels are the only boats which sail regularly to the Northern Mariana Islands from other destinations. A Tinian Dynasty Hotel and Casino ferry makes round trips between Saipan and Tinian four times per day. Each of these journeys takes just under an hour. There is also regular ferry service between the islands of Managaha and Saipan. Privately owned shuttle buses traveling between DFS Galleria Saipan and several Saipan hotels are the only major public transport options on these islands which lack any rail or public bus services. Many Saipan hotels also operate their own private bus tours to various island attractions.