The important thing about doing any of these things is never to make a big deal about it, never to do it for any purpose other than that it is part of you and the right thing to do. I do these things as habit and I don't think about it at all (except for these threads), and if someone made a big (negative) deal about it I would just kind of look sadly at them and shake my head. As it is though, I have never had a bad reaction like a woman giving me some feminist lecture or anything. When it is brought up, I just shrug and say it is habit. I don't expect any kind of reward, and I don't resent doing any of these things "for" women/people, I just do them, I guess as part of being male and getting to go through life generally free from the threats that women face. Chivalry or whatever you want to call it, to me, is the deliberate ceding (or use for women's benefit) of the male privilege of being born to be naturally bigger and stronger.
The three courtesies... no wait, let me come in again. Amongst the courtesies I habitually provide are the aforementioned opening/holding doors (but not going way out of my way to do it), opening car doors (for females only, they have nails that can scratch paint you know

), walking traffic-side on the sidewalk except when walking "creepy-guy-side" seems more prudent, standing between creepy guys and people I'm with, excusing my way through crowds to make a path, standing down creepy/insane/threatening people who are worrying my companion(s), talking to management privately to have creepy people removed when prudent, staring down/talking down/defusing general jerks and louts, steering away from confrontations when possible, etc.... all while trying to retain as much face as possible for the defended-against person, because insecure people often take that very personally, I do not need to worry about my own, and putting people down is ungainly. Again, this is not something you do to get some reward, it is part of being a man.
I really don't know how this post got so long, but anyway, there you go. Remember, if you must flex nuts, always do so discreetly.