I came from a divorced family, and experienced divorce myself. This is what I have done to make these amazing years with my hubby better than our first:
I have learned to say "I'm Sorry" and mean it AND not expect to get my way because of it. Saying "I'm Sorry" even after an argument is really, really hard. I tend to say it, even if I am "right", but expressed it poorly (yelling, said something not so nice, etc.) and I say it almost immediately, when we are both still angry sometimes, because I want him to know that though I may be angry or may disagree, I love him and value him, and want him to know I regret anything I might've said or done that goes against that (it's the whole actions speak louder than words thing).
Know that the man you married is the man you married. Women tend to think we can change people, and people do change to a certain extend, but the core of who a person is doesn't. So, if he or she behaves a certain way that surprises us, it's not that "they changed", it's that we didn't know them well enough.
And like others have implied, nurture the relationship. It is easy to get caught up in the parenthood, workinghood, whatever else-hood of life and not nurture the relationship. When life gets super crazy and hectic, often times this is the best time to figure out a way to squeeze some time to reconnect, to remind yourselves why you chose to take on this path together...it then makes it easier to tackle all else life throws at you, together.
Pick your battles and learn to let things go. We tend to hold on to grudges, these grudges stew and become bigger things. Talk about it, try to figure out ways to make it better if needed, but don't be pissed about it cause you'll always be stuck in a bad place.
My husband and I talk a lot, kiss a lot, and date as often as we can. It makes us better lovers, better parents, and better friends. I praise the sweet, nice, thoughtful things he does and celebrate them because though I know I deserve to be treated well, he doesn't owe me that. No one owes me that. I earn it.
And lastly, take care of yourself and love yourself. When we love ourselves, and are good to ourselves, this makes others want to be around us and love us too. Not sure why, maybe it's the certain glow, or positive vibe that draws people. My husband calls it "sexy", I just call it being happy on my own merits.
Not an expert either...just someone who has been there, done that, and kinda found what works.
Good luck on a happy, wonderful experience!