If you go to Japan you have to go to Hiroshima, it's a must! Hiroshima has a lot more to offer than just the ruins of the only building standing where the bomb landed on 6 August 1945.It's a great city to begin your trip with, it isn't as busy as the other big cities in Japan.Hiroshima has lots of nature to offer to you.The quickest way to travel is with the autobus that is what they call it it's actually just a tram. 
If you like to walk/climb and love nature I would recommend you to go to Miyajima.Miyajima is an island and it is famous because of his shrine and the reindeer's 
The shrine is so special because of the ebb and flood.Miyajima has a lot of temples too.You can walk up the mountain thanks to some climb routes.You can choose what kind of routes you want to do, but if can't walk easily I wouldn't do it.You need to watch your steps very carefully because the routes are quite steep and the stairs aren't that great.But when you reach the top you can see the bay of Hiroshima.(I got lost when I was walking up the mountain which caused a walk of 19km, it was exhausting but the surrounding were beautiful!).Going there cost around one day.
secondly, you have to go to Hiroshima castle even though it isn't the original one because of the atomic bomb.There are also the remains of the original castle but it isn't that impressive.Next to the castle you will nice park where you can relax 
Just being in Hiroshima for 2 days is enough for enjoying the parks, nature and a quite city life
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