Worth visiting Tazawako in winter

I have spare 3 nights during my visit to Japan this month before heading back to Tokyo from Kanazawa. I had planned to visit Kyoto, Takayama, Shirakawa-go and Nozawa onsen. Was thinking of going to Tazawa ko for a nature and quiet winter. I have JR pass. Not sure if this is good idea as when I check on line for travel information, it seem to have little information.

If it is worth going, how long you think is sufficient ? Where around the places we can visit too ? I am planning to stay Morioka. Or any suggestion ?

Thank you very much in advance for answering me. Cheers.

Lake Tazawako is beautiful in winter, but I personally never found it worth a trip on its own. However, Nyuto Onsen, which is located in the mountains above the lake, is one of the best hot spring resorts in Japan. Very rustic and traditional. It is very beautiful in winter:
http://www.japan-guide.com/e/e3650.html

I second Nyuto Onsen, especially in winter. Particularly if you are onsen lover.