I think the best way to be an activist is to live your life well and be honest. It means being out. If you are not comfortable marching, you can make a big difference just by working side by side with someone who actually knows you're gay and a fine human being.
At the end of the whole thing when it was over, I came home to a bouquet that said 'in sickness and in health,' and she means it, ... And the love and support of someone like that is worth all the money in the world.