pronobon - as I said, I do very little now. It's a lot to do with location: marching is easier if you don't have to take time off to get to/from the event, etc. Marching is great, it feels very powerful and you start believing in sisterhood and that you're not alone, etc etc. In some ways, marching is the easier part (though it would be waddling now!).
I think we're rather mistaken if we say to everyone who calls themselves a feminist "Well, what do you DOOOOO about it?" because it starts to look like we're checking ID cards at the door. For me, a lot of my feminist activism is challenging people's sexism, jokily, politely, or downright angrily, in a day-to-day setting. I do give small amounts of cash to groups that do more marching and shouting, and groups that do lobbying (the fawcett soc is dead good) but I don't think that's what makes me a feminist so much as my beliefs.
I know it's no good if you don't act on your beliefs, but most of my important activism is day to day. Heck, I care about animal welfare but when asked "Well, what do you DOOO to help animals" I can only say: I adopted a rescue dog, I tell people about puppy mills, I know where the meat I eat comes from, and I occasionally give cash to the humane society. There's only so much I can do, but the fact that I have limited time and resources doesn't mean I'm not committed to animal welfare. We have to be careful that demanding proof of 'activism' isn't basically an ideological purity-test.* And - this is key - space to TALK about things, space to challenge predominate ideas, space to test out ideas - this stuff is really important stuff. Telling people they 'shouldn't be discussing WhateverTheorist or their personal circumstances because INSTEAD they should focus on the people who are dying/starving/suffering in another place' has been a successful anti-feminist silencing tactic in the past. I'm not saying you're doing this - I know you're not - but I am explaining why some people might be wary of being asked to prove themselves, if that makes any sense.
(*I probably DO have an ideological purity-test, actually, but it's closer to: Do you think women are people? Do you trust women to make up their own minds about what to do with their bodies and lives? Do you think sexism is ingrained and invisible? Right, you're probably the same kind of feminist as me, then.)