I hear ya LWJ. I used to be a cross country skiing winter back packer. No can do anymore. I also got into snowboarding with FBII but again it's not something I can do anymore. I can ice skate kinda sorta but I spend more time getting up from a fall than actual gliding.
So, looking for something to do out of doors that helps me tolerate the gloomy months is a challenge. I have a county park of "near wilderness" condition only 2 miles from home where I can hike, and snowshoe and I enjoy that a whole bunch.
The one thing I did which is quite extravagant for me was to build a screenhouse in the backyard. I can take a book and a pot of tea there and basically be outside but under a roof.