Goolgle Map of Hiroshima
Hiroshima Navigator has downloadable maps
here.
You shoud go to Hacchobori and Kamiyacho. Kamiyacho has a rail and bus terminal. Take a Hiroden streetcar to get to these intersections from Hiroshima Station.
Kamiyacho (紙屋町)
To the north there's the Castle. To the northwest there are museums, libraries, and the municipal baseball stadium. To the southwest there is the Peace Memorial Park.
Hacchobori (八丁堀)
To the south there's a
nightlife area, Nagarekawa.