This service, cruising to four islands of the lake, offers you a crusing experience with the elegant Espoir that resembles an old castle of the Medieval Times. The boat stops at Oshima Island that is inhabited by wild Ezo deer. On the island, you can also visit the Lake Toya Forest Museum that has exhibits about the natural environment around Lake Toya and the formation of the lake. During the firework festival period between late April and later October, the boat company offers firework-watching cruise services so that the passengers can enjoy the fireworks from the lake.