A person having a tattoo is the case which can take a bath in onsen.
1. In high-quality Ryokan,
Because there is onsen in a private room,
Even if there is a tattoo, it is all right.
However, you cannot enter a common use bathhouse of Ryokan.
2. In an onsen institution, there is a thing having small charter onsen for families.
However, you cannot enter a common use bathhouse of this onsen.
3. Because there is not a manager, as for the natural onsen, you can take a bath.
But there are not dressing rooms.
In addition, it is difficult to go to the place.