It's not sea bass. It is actually a bus to get to the places thru Tokyo bay. There is a station near Hamamatsucho station and my favorite is to go to Asakusa from there on a nice day. You go into the Tokyo bay and go down the river and under some historical bridges in Asakusa. There are several kinds of cruisers and hopefully you get on to the one you like!! There is also a cafe by the station...there is frozen yogurt place and it's good. You can also go to odaiba from there as well.