i find starting up an industry to be satisfying and a good way to make the in-game days pass quickly and without tedium. For this, I rely on mods. Ironworking is my favorite, and weaving is also very fun.
One survival maxim is to improve your situation at least a little, every day. With this mindset, you can usually think of something to do. Why not expand your home, build an addition or a new shed to store things? Dig a well, or gather the materials for a kota. Create a large farm, with many animals, many plots of crops and a large herb garden.
One lifestyle I've never managed to actually get off the ground is travelling kota-dwelling nomad, using a reindeer (or 2 or 3) to carry my supplies and the materials for my kota, and travelling light with just my bow and a few dogs. I think it would be pretty cool, but somehow my nomads always end up dying before i get to that point.
also, I want to mirror others in saying that I find UnReal world to be a very effective pastime for when I cannot get out in the real woods. It really does an effective job in cultivating the exact "mindset" of real wilderness living. In fact, sometimes even when I am in the woods, I play Unreal World when it's too rainy to do much outside! my unreal world character really is like a "second me", a persona that I can use to explore options and life-paths that would be too difficult or dangerous to do in real life. Of course, I would love it if I could make a 4 km trap fence and funnel all the life of the woods into my dinner-pot, but that is illegal pretty much everywhere
. I tend to grow very attached to my Unreal World characters, and I am proud to watch them grow and thrive. With this in mind, I generally try to treat them like real people, and ensure that they get enough sleep, enjoy some variation in their diet, and sometimes do things just for fun or to make their life more comfortable. I find it makes the game much more satisfying to play. I suppose some might find it odd that I lavish such care on a little pile of pixels and numbers, but this is my hobby, and I enjoy it. I also find that it has some level of cross-over to real life situations - when I've been playing unreal world as opposed to other games, I find my mind much more readily adapts to wilderness living. I am able to plan out my actions intelligently by simply thinking, "Hm, what would I do in Unreal World?"
I'm not trying to say that Unreal World is adequate training for a survival situation, real life is far more complex and you also have to actually chop down all those trees yourself, not just watch a little animation! but, when played mindfully, it can help your brain stay in the correct mentality.