Have you heard of this place? It's a few hours outside of Toronto and completely worth the trek. It's ridiculous that it only costs $50 to spend the day here.
There are outdoor heated pools, a cold plunge pool, relaxation rooms, a sauna and a eucalyptus steam room that you can venture into throughout the day. I've only gone during the day (it's best to show up as soon as they open since you might get wait-listed if you show up mid-day), but I can only imagine how gorgeous this place would be at night.
One tip? They have a man who walks around and tells you to quiet down if you're too noisy so keep that in mind. (He says it in a really nice way, though, so it's not too embarrassing.)
They offer massages that you can book in advance as well. I opted not to have one since, well, massages are awful and last way too long (why can't I just pay, like, $10 for a five minute massage? That's all anyone needs.), but I've heard the ones here are pretty good.
That photo above was taken at the end of the day - can you tell how relaxed I am? No? Well, I think I always look relaxed so it's hard to gauge the varying relaxed-like features, so let me assure you that I was.
You should definitely check it out the next time you're near Blue Mountain. Thanks for introducing me to this place, Marla!