The best natural hot springs in BC!! This is not a trip report, but my recommendation!
I recommend Liard Hot Springs 100%. I should definitely visit there if you are going to Northern BC. It is right before BC-Yukon border on Alaska highway.
My friend told me that the water becomes a little cold in winter. Anyway, here are some photos when I went there on March 31st.
Link to Liard Hot Springs:
Sea to sky 