Don't have a daughter. Do have a niece. I do treat her a lot differently than my nephew (I've also been pretty active in their lives and upbringing, helping my sis back when she needed it the most and so on, while also taking the back/'uncle' seat most of the time - seeing as they're not my kids and all).
With my nephew, I was more about getting him to see certain truths about being a good man. Not all that "Man breadwinner, woman homemaker" crap - more the opposite, if anything (without it being the opposite: the old-style paradigm doesn't stack up anymore and can certainly never lead to gender equality). But things like being respectful of women without being fearful or in awe of them, knowing when to step forward and when to hold back. Things that, from the outside, look simple and obvious but aren't really, which ultimately helps create 'a good man'.
With my niece, I've not been as harsh. I have warned her repeatedly about guys, especially now she's in her teens - things like "The ones who always seem to know what to say are the ones to avoid, because they've had plenty of practice" and bits and bobs about what she should expect and what she should never put up with. And if I ever hear a guy call her things like 'ho' or 'bitch', he's getting taken to school, on the end of my boot if need be. As for if a guy hits her...well...goodnight, sweet Prince.
But yeah, I warn her about blokes and she looks at me with this "What do you know?" expression, but it's as I said to her not so long back, just because she now sees an old, declawed, fangless thing well past his prime, it doesn't mean I wasn't a young tiger once; I know how they prowl, just as I know some are far more aggressive and 'assertive' than others.
The other thing I tell my niece, a lot, is that she can do whatever the hell she likes when it comes to careers, etc. Even now, in school there are things that girls are aimed more towards than boys, or things that are not quite closed off to girls, but aren't anything like as open as they are for the lads. I just tell her it's fake outdated BS and to fight to do the things she wants to do, if she has to. Though the fact is, she (and others) shouldn't have to fight in the first place - just as boys shouldn't face a fight if they want to do things like Home Economics and Catering, though they do.