This is just odd that drunk cycling is considered just as bad as drunk driving. But should there be some kind of penalty? Maybe a different limit or just a public drunkeness citation similar to if you were walking drunk? If I were biking so erratically that I might hurt myself or someone, I'd want a cop to stop me. On the other hand, I don't need 11 months in the hoosegow to sober up, a few hours would do for me, thank you.
Here in Ontario, DUI laws only apply to *motor* vehicles. However if you are drunk on a bike and biking erratically then you can still be charged with "Careless driving". (and probably some kind of public drunkenness thing too, and no doubt mischief depending on what you are doing!)