at low doses k gives a spacey feeling and is ok for clubbing. higher doses are more interesting and best done at home with some friends.
listen to people with experience. not those who have read scare bullshit from the net or heard wild ranting from "friends."
k can give you some pretty wild perceptions so take care. although i never did ... it's not a big deal as some make it out to be. it can be pretty amazing actually.
an interesting read:
http://www.ketamine.com/john-lilly.html