www.kibbutzvolunteer.com. This site seems to have pretty good information, and can point you in the right direction to making things happen.
You may turn this down out-of-hand thinking, "Why would I go to Israel? I'm not Jewish!" but trust me, there are plenty of kibbutzim that don't practice Judaism any more than you do. Experience socialism in its modern form, make some friends for life, have some crazy stories to tell. Kibbutzim will be happy to take you, regardless of religion, they are always looking and appreciative of volunteers. You'll make friends with people from all across the world in these volunteer programs.
Seriously, this is an extremely viable option. If you really want to do something different, look into this. Let me know if I can be of more help.