Choshi Station is the terminus of the Sobu Line and the Narita Line, and the starting point of the Choshi Electric Railway.
It is a terminal of Choshi City, and in addition to trains, you can also use local buses, taxis, car rentals, and bicycles.
There is a tourist information center inside the station, so it might be a good idea to check it out and get some information when you first arrive in Choshi.