I had a script of Klonopin for anxiety. Like HYDRO said, 1mg is fine, 2 is alright as well. Up to 3-4mgs would be fine for recreational use, but if you haven't done benzos before, just start at 1 and work your way up.
It can potentially make you sleepy. Some people use this as a sleeping pill. It won't neccessarily put you to sleep at a dose lower than 2mg, but it can make you really tired and relaxed.
I got nasty hangovers from it, though, which is why I stopped using it. I'd feel too whacked out and not together the next day after taking it.