Translation:목욕하러 목욕탕에 갈 예정이에요.
What's 예정이에요? Shouldn't it be 갈 것입니다? That wasn't even an option.
In future tense (X을 것이다) the 것 part can be replaced with 예정. The meaning stays pretty much the same, but this puts more emphasis on the fact that you are planning to do so.