We already have a question about ferries from South Korea to Japan, but my question is can I just show up at the port and buy a ticket for the same-day ferry or do I have to book it in advanced?
I usually never know when I arrive somewhere or in this case when I will be ready to leave Korea, so ideally I don't want to make any advanced bookings except when the prices are significantly cheaper.
I don't have a vehicle and I don't know yet which of the ferry routes I will use.