Hi @Emilie, we haven't yet made that available to guests so I can't really say what reaction would be. My guess though, much smaller group of people interested, but those who are would be enthusiasts.
Ice bath is wonderful and I love doing it, but a lot more challenging for most to get their heads around than sauna.
Put another way, I've heard sauna described as that rare thing... a bona fide health intervention that's also very pleasurable and easy to do. Not too many of those out there. Ice bath likely has some interesting benefits, and I find you feel pretty great after. But for most, the pleasurable and easy parts are subject of some debate.
From a host perspective too, I suspect outdoor ice bath would be more of a hassle to manage, keep clean etc. Unless you got one of the new powered ones which are nice. But combo of pretty high price tag to invest in, and small (if enthusiastic) audience makes this a less appealing host move to my eye than say sauna or hot tub.
R