Well of course one thing is to find the best Okonomiyaki in the world.
http://nagataya-okonomi.com/
https://www.instagram.com/okamotos329/profilecard/?igsh=a2w2NXFiNDd1M2d4
Or a day trip to local sake breweries
https://www.getyourguide.com/en-au/hiroshima-l32662/hiroshima-sake-town-tour-in-saijo-hiroshima-t648826/?ranking_uuid=919b99ba-7b21-4a5c-a61c-48f1a8a4577a
https://www.japan-guide.com/e/e2160.html