I recommend cheese. Lots of cheese. And actually exercising. Thinking about it, an indoor gymnasium seems fitting to be on the mansion's grounds.

Though I can also imagine Hecatia running one in Gensōkyō. With the Roman bath too to challenge the Japanese bathing culture. 🤔 Actually... yeah, they should definitely have a sentō 🤨 Now that I notice, we don't really see bathhouses in Touhou, do we? No, no. Onsen is different.