Travel to Japan

Looking to travel to Japan with three others. Middle of June 2026 is the timeframe I’m focusing on.
Kicking around the idea of doing a cruise around Japan to simplify travel within the country and to have a single base “hotel” so we don’t have to pack and unpack every time we go to a different city.

Does anyone have experience with cruises around Japan and how to find good deals? Prices seem really high.

by Apecker919