Should I study abroad in a country where I already speak the language or somewhere completely new?

I'm planning to study abroad over the summer but I'm not sure where I should go. I'm half Japanese and speak Japanese fluently so my family suggests Japan by default; however, I'm wondering if that would be wise. I've been to a lot of countries in Europe and a handful of countries in Africa but I've never been to Australia or Central/South America. Would I be wasting my potential by not picking Japan or not going somewhere new?