Well, there are a number of aspects. I (Dad) was more or less solely reponsible for our son (who is now 6 and happily at school) from the age of just over 1 year until 4 1/2 years of age as my wife was studying far more than full-time. Fathers who actually take an active role in parenting small children seems to be a bit of a curiosity here. Everybody SAYS that they would welcome fathers who actually take a more active parenting role, but get uncomfortable when they actually see one... I got all sorts of reactions from Swiss ranging from "Jeez, your wife must be a real dragon to force you to take care of your kid" to "I distrust any male person around small children as they are all (at least latent) pa*dophiles." Also reactions of people in the trams, at the playground, etc. Things like people never daring to put their grubby hands on my son in the tram and my wife always complaining that old ladies kept patting our son in his pushchair when she was alone with him (because he was - and is - "soooooooo cute"). Maybe something to do with the fact that I'm 1.80 metres tall, athletic and tend to growl when people got too close to him? Maybe...
Little things like the fact that often nappy-changing facilities are in the ladies' restrooms. Great. So I either crash into the ladies restrooms and get beaten senseless by ladies who think I'm some sort of perv or change my sons' nappies in public and get beaten senseless by old ladies with umbrellas who think I'm some sort of wierdo...
I know all about the trials and tribulations of finding a place in a creche and the reaction of co-workers when you say you can't come to a meeting because you have to pick up your kid from kindergarten. If a female colleague says that, that's okay, but a man? That's... kind of... wierd... sort of ... ehm... unmanly.
I guess some of my observations would have a slightly cynical tone (I managed to keep my sense of humour, though... I hope). Nevertheless, I am and remain a 150% enthusiastic father and would not have done anything differently or wanted to miss out on the great experience of spending a great deal of time with my son and being there as he developed from a baby to a little boy to a not-so-little boy.
Oh yeah, and all kinds of ideas of things to do, places to go, tips and ideas on travelling with kids, cooking together with them (i.e. letting small kids participate in preparing meals, which can be so much fun), games out and about to help them learn numbers, etc.
And so on and so on...
Cheers, Danis