[ChisaChi]

Someone who has lived there might know a bit better than me, but tattoos carry a bit of stigma in Japan due to associations with the yakuza. I do know that an old boss of mine was told to cover up his tattoo while swimming in a hotel pool or not swim at all - he's English, and clearly not affiliated with yakuza, but it doesn't matter. I'm told you'll get similar reactions in public bath houses or hotsprings. Beyond that I'm not sure if there will be any more negative reactions what you'd get in your home country.