I think I have a genetic inclination towards nature and isolation...
My dad was born in a mining camp on top of a mountain in the interior of BC and worked as a prospector for years, living in the bush, hiking around and taking mineral samples (he has a degree in geological engineering.) He never had any use for people at all and is only really happy in the bush by himself.
But I never really spent any time with him as a kid and we've been camping together once - a couple of years ago. He used to go by himself when I was a kid and although I always wanted to go with him, he would only take a dog. I'm really serious when I say he had no use for people! He didn't want to be around anyone, he just wanted to be by himself in remote places.
Now that he's approaching seventy, he has calmed down quite a bit and tolerates people a lot better and I've gotten to know him pretty well. I have the same misanthropic tendencies but unlike my dad, I am a complete extrovert and like to socialize quite a bit (it's a complicated condition, misanthropic extrovert.) He is a serious introvert and it really took about thirty years for him to warm up to me.
But the point is that although he really had no influence on my life growing up, it turns out we have a lot of the same interests and habits, only I fortunately inherited my mom's friendliness! Otherwise I would be afraid to have kids...my dad really resented the intrusion a bunch of extra people turned out to be but I think I would like kids and watching this forum, I've learned a lot about what you can do with your kids to enjoy their company.
So in my case I think it's definitely nature, but I hope to also nurture my kids so they don't have to figure everything out on their own! Also I promise not to get mad at them for talking (dad hated talking or other evidence of human beings!)
Luckily my girlfriend - who after 8 years is effectively my wife - has a similar feeling about camping and the wilderness to me. Her dad was also a real introvert but fortunately is just a guy who likes the wilderness, not a guy who hates human beings so much he just wants to go anywhere he can't find them. So she was brought up with regular camping trips and extended stays at a cabin in northern ontario which her father built. So I think it won't be difficult to give our kids a good wholesome wilderness-friendy childhood, when we eventually get around to having kids anyway!
You know it's always been confusing to me why my dad had kids at all or how he ended up with a wife...I guess somebody took him for the strong, silent type and he was pretty good looking. And I guess if you can get him to speak, he does say really funny, sarcastic things. Still I would have to describe my mom as a saint for putting up with him for all these years.
But I am glad I inherited his interest in the wilderness!