I belong to a couple of writing groups. When I attend those, I nearly always come back ready to write. And the best part is the writing has creative energy behind it.
Depending the frustration coming from my writer's block, it varies as to what I decide to do. For me, it works a lot of times to talk to people or change my scenery. Not always, but usually, something will inspire me so that I can go back to writing. I'd love to hear what other writers do!