City #2 to visit with 12 year old son (that isn’t Kyoto or Osaka)

Headed to Japan for 8 nights in June.

Flying into and out of Tokyo.

I’m going to be solo (dad) with my son (12).

I’ve been to Hiroshima, Kyoto, Osaka, Nara and Tokyo.

He likes baseball, history, food and video games.

So…what’s a good place to visit for 2/3 days in the middle of the trip that isn’t somewhere I’ve been before? The Giants are playing while we are there so at least one baseball game is covered.