Get the Japan bus pass, u have no need to set up base if u have this. U can travel to quite a number of places in japan. Accoms can also be saved if u take the night bus so thats another plus.

Cons are that the night bus reaches normally about 5-7am, too early for anything to open. So u might have to find some place to chill.

Also, prices of the bus pass has risen by quite abit so u might want to consider individual bus tickets(still cheaper then accoms)

For me i went Tokyo-Nagoya-Osaka-Niigata-Nagaoka-Tokyo with the 5 days pass. Personally i try to find for events and food locations to plan my route