Yes, I think it's really safe. There are no pickpockets or criminals targeting foreigners. However, I think sometimes it is difficult for foreigners to travel around Japan by themselves. There are no English signposts and there are relatively few people who can speak and understand English in the countryside regions. However, big cities like Tokyo or the popular cities like Kyoto have a lot of English signposts and information pamphlets for tourists in English so they are good places to travel. :-)