I am really enjoying reading the responses.
Despite the fact my father died suddenly when I was 12, leaving my mom the sole breadwinner unexpectedly, I feel I still had a good childhood and especially good teen years. My mother was an intensely private person who was not very demonstrative -- except with me, and she never stinted on hugs, hand-holding and kisses, even when I was an adult. She worked full-time, not just after my dad died, but all her life, so there wasn't a lot of "she taught me to ride a bike, she baked me brownies".....The person who was at home when we came in from school, the one who said "Let's eat this cake while it's warm!" though dinner was an hour away, was my grandmother, who lived with us all my life, until she died when I was in my late 20s. So I had a working mom and an at-home "mom." A cuddly, cake-making adult and a serious, results-oriented adult. I got so lucky.
The best thing my mother did for me was to say yes to opportunities that came along, and to be supportive in a very quiet way. She could have said, "No, I don't want you going to Japan for a summer as an exchange student" but she said "If it's what you want to do, that's fine." She could have said, "No, the college you want is too expensive and too far away" (a lot of my friends' parents said that) but she did not, and I was very happy with my choice. She could have advised me against going to grad school abroad, but she sat me down and told me how much money she had saved for me to have at college graduation, and that I could use it for grad school or anything else I wanted. She never pushed anything on me, and she made me find opportunities for myself, but she also never stood in the way, and quietly found ways to say, "If you want to do X, here is an option for making it happen."
I guess the lesson there is: Don't get in your kids' way and micromanage them, but be clear with your support, both emotional and financial when it's appropriate. And don't tie everything up in strings - I knew so many kids in college with me and young adults after college whose parents had made "deals" about how the kids would go to a specific college (or lose all support), or do the major mom and dad wanted them to do, or "try" the career mom and dad prescribed. And those were almost all really unhappy college kids and young adults.
She also was very good at rewards out of the blue for no special reason. She did things like hand me the car keys and a few bucks, on random days during high school, and say, "Go off campus to lunch today, just pick me up when I'm done with work at the end of the day." And things she knew I liked would appear, rarely but regularly, without any fanfare. I think because I never asked her for anything, she felt free to do those things, and I really appreciated them, and her, so much, and let her know it.