From Hiroshima airport to the city

The easiest way would be to take the Airport Limousine Bus. It takes about 1 hour from the airport to the city. The website below has details on the bus schedule. This bus takes you to Nakasuji station (astram line) where you can get on the tram for the station nearest your hotel. If you're heading directly for the Peace Park, you need to get off at Honsuji station and it's a little less than a 10 min walk from there.

http://www.hij.airport.jp/timetable/access/timetable.pl?operation=detail&mode=en&s=201704&e=201706&kbn=1&grp=1&f=1