this page could be useful for you. www.ecotourism-israel.com/Accom...on.htm

but i'll just tell you off the bat that you're looking for Amirim - that's what suits you.

here's the amirim website directly: www.amirim.com/

basically almost every kibbutz is acceptable to most vegetarians, bc the dairy meals are cooked on crockery, etc that has never touched meat. but amirim is vegetarian and organic and i know plenty of cool young people in israel who've volunteered there. i'm not too sure they'd want a volunteer who didn't speak hebrew fluently, but then hebrew fluency is fairly necessary for doing almost anything cool in israel longer term. anyway, best of luck in the north...we're looking to have our spring rainbow gathering up there somewhere.