Yunessun is a well known spa located in Hakone. It’s an interesing spa because they add common drinks to the baths/ofuros. The most well know are the wine and the sake baths, but there are also ofuros with beer, green tea or even coffee. I would try the green tea one, but I don’t know if I would like the one with coffee.
Picture from Mdn)
Green tea bath.
Coffee bath.
Access information here.