Nimbin is famed for being the 'hippy' capital of Australia. Don't be fooled. Yes, there are one or two spaced-out backpackers wandering around and some elderly acid casualties sitting on the street, but the main thing you will find is alcoholics and junkies.
Avoid it - it's depressing.
initially I found nimbin a bit seedy and confronting, however the more time I spent getting to know the place and speaking to the locals the more appreciated its unique charm