Beer: Today, the city is home to only one major brewery, a little company called Miller. Still, there are a few craft breweries in the area that offer higher gravity beers and more personalized tours, and there are certainly more than a few bars where you can wet your whistle.
Riverwalk: Where as many cities that boast a riverfront developed it after, or in conjunction with, their downtown areas, Milwaukee's famous Riverwalk was actually responsible for the development of much of its downtown.
Festivals: Milwaukee has made a distinct effort to brand itself as the "City of Festivals," and not without good reason, the most prominent of which is Summerfest. Set along the lakefront and drawing around a million visitors, is the largest music festival in the world.
Food: Milwaukee has an immigrant heritage that is long and strong, and no where is this evidenced more clearly than in its dining scene. Neighborhoods like those surrounding Old World Third Street boast some of the best and most authentic German and Mediterranean restaurants in the region. Milwaukee Street is a main drag for trendy dining options, and it sports a lively nightlife to boot.
Source: http://www.10best.com/destinations/wisconsin/milwaukee/