The big thing for me is definitely kids. God, I'd love to be a father more than anything someday, and though it would be a fuckton of work, I definitely wouldn't mind winding up with something of a large family in the end, with four kids or so, because no matter how much work that ends up being, I know it will be worth it for me in the end, no question.
Life is just so incredibly awesome in so many ways and there's no way I just want to keep that all to myself--I want to do my part to help bring a new generation into the world and help to give them the same opportunities I had and more to absolutely fall in love with the world and be there to watch and gently push them along as they're doing so and going to the zoo for the first time, or the beach, or going camping, going to a planetarium, and hopefully some of the same places I was lucky enough to visit as a kid, like Disney World and the Grand Canyon. If I can come anywhere close to accomplishing that and end up giving them even a fraction of the love that I have for the world and all the incredible sights and people in it, I will die a very, very happy man.
In terms of careers and stuff though, I don't really care as much, as long as it ends up paying the bills well enough to help me take care of my family, though I'm currently going to school to try and become either a school guidance counselor or a school psychologist, depending on how things go.
Outside of those areas, I'm really feeling Kathryn's answer, as it pretty much sums be up to a T as well (though I'm single at the moment, though finding that special someone and making them as happy as I can is obviously another big aspiration of mine):
I think I'm driven by my optimism. So no matter what, I'll find something to do.
For life in general, I just want to spend every second with my girlfriend and make her happy, know that my friends and family are happy and healthy, and enjoy life as much as possible. Beyond that, I try to do cool things when the opportunity presents itself.
As for how I arrived at those conclusions, well... it's kinda of a long story, but if you insist.. I never really knew what I wanted to be when I grew up as a kid and this was always a big source of worry and dread for me. This remained the same as I was finishing with high school. Despite this being the case though, instead of making what would have been the wise the decision to just stay home and take a few years off to find myself before I started university, I made the decision to rush off to college anyway and just hoped that I'd manage to figure it all out somehow as I was there.
Unfortunately though, I didn't and in the few semesters by first try at college lasted, I just switched between wildly different things until ultimately I just dropped out. Of course, in making that choice, at the time I felt that my failed attempt at uni had basically just confirmed the fears that had haunted me all my life, and that there simply was no career out there that even remotely called to me at all and that there was really nothing in particular that I wanted to spend my life doing or trying to achieve or anything. Pretty much, the only thing I cared for in life was just playing video games, and that was basically it. As a result, I fell into what I realize now as a depression for a while.
But I managed to beat that shit just through pure luck really and how that happened was that it just suddenly clicked one day that despite having no desire to ever have them before that and absolutely despising the idea, one day it just suddenly clicked for me that maybe having kids wouldn't be so bad after all, and then in just ended up snowballing and I realized that I wanted to have kids more than anything in life. I can't explain what caused the shift exactly, but for whatever reason, that switch flipped and there was no going back. Of course, at first, this just made me even more depressed as now I had this huge desire, but I didn't know what to do about it or how I was ever going to make it a reality, since if I wanted to have kids, obviously I would need a well-paying job in order to properly take care of them and that retail probably wasn't going to cut it, but I was just terrified at the idea of going back to university because I didn't have any money and the last thing I needed was more student loan debt and unless I was absolutely certain of what I wanted to do, there was just no way I wanted to add anything more to the pile.
But eventually, I conquered those worries and just wanted to do whatever I could so that I could even have a chance of having kids, and so I made the decision to return to CMU and ended up deciding to major in Psychology, with plans to go onto graduate school after I get my B.S. to hopefully wind up being a high school guidance counselor in the end, so that I can help kids who went through exactly the same things I did at their age, knowing exactly what it feels like to seemingly be hurried off to college by everyone you know despite not having a clue what you want to do and not wanting to be left behind by them, and just do my best to let them know that I've been there and made it through and just try my best to make sense of their interests and suggest possible majors for them to consider and if that doesn't work just actually be there for them and stress that it actually is in fact perfectly alright to take a few years after high school if they need to in order to find out who they are as a person and that there's absolutely no shame in that and that either way, I'd be there for them to do whatever I can to figure out their future alongside them and to point out that if someone like me can figure this out despite worrying out the same things practically all my life, I'm sure that they can with the hopes that in pointing this stuff out to them, I can hopefully do what I can to nip any potential problems in the bud and not have them make the same mistakes I made due to my worries.