Spent 5D4N using Hiroshima as a base to travel around. Here's my recommendation:
HIROSHIMA Food: Okonomiyaki, Tsukemen Attractions: Atomic Bomb Dome, Peace Park, Museum, Woodegg Okonomiyaki Museum (about 30 minutes ride from Hiroshima downtown to nearest station Inokuchi via Streetcar, 10 minutes walk away from Inokuchi station. Museum & Factory tour is free, okonomiyaki cooking class with a fee of 1,500 yen. Reservation needed @
MIYAJIMA 1 hour plus ride via street car from Hiroshima downtown to Hiroden Miyaguchi station, then take 10 minutes ferry from there. Attractions: everywhere on this island is so beautiful! too bad the torii gate was on maintenance when I was there :( Food: Oysters, Momiji, Lemon Soda!!
MATSUE 3 hours bus ride away from Hiroshima. They are running tourist promo from Hiroshima-Matsue for only 500yen one way (1000yen return) - Food: anything with Shimiji clams Attractions: Rode the tourist bus for 1 day pass @ 500yen!! Free foot bath beside Matsue Shinjiko Onsen Ashiyu station!!! Many more to do please go search :D