Take a walk up to this Mt.Mitate viewpoint on a clear day to see Hiroshima city, the main rivers that criss-cross through the city, and in the distance, see the Seto-inland sea & islands beyond.
This is a fairly easy 20-30 min hike up to the Mitateyama viewpoint from the Ushita-Big-Wave Astram (monorail) station which can be accessed by JR train (from Shin-Hakushima station transfer to the monorail).
See more details about this great short-hike in Hiroshima city here:
Location on Google Maps :
AloJapan.com