Our little girl is coming up to 2. At the moment she doesn't make too much noise, never screams or throws tantrums when out and can be taken to any retaurant that has kids seating.
Maybe that'll change but even at her age she knows that behaving while out gets her far more than being naughty. You just gotta reward them at the right times and for the right things. If she ever asks for a sweet or treat she never gets it. She only gets them as a reward for good behavious AFTER the trip
Works for me and works for children much older two as my step-children were exceptionally well behaved using the same method when I had them.