Lucky, I've never had a DUI or any traffic offenses but one thing you do not do is admit to anything, because for all you know you might be under the legal limit.
My advice for your best chances are to take the alcohol test in jail that way it gives you time for the alcohol to leave your blood system. They are going to arrest you anyway under suspicion anyway so play the game carefully. Wouldn't matter anyway my neighbor has 9 DUI's and still retains his liscense.
I can understand the situation in front of the Police of whether to cooperate or not, that's why I just say "I don't drink" no matter how drunk I am, proven or not. Yeah it's a lie, but the main reason why I have never had a DUI is because I DO NOT DRINK AND DRIVE!