In Austria we have literally hundreds of breweries- large and small and many independent ones (Hirter, Kapsreiter are for example some of the better ones)- but hands down I must admit that the tab-beer, fresh from the barrel, in several beergardens in Munich was even better. For summer I'd recommend the Hirschgarten near the train-station, or also the Augustiner- or Hofbräu, in every season.
Here in Vienna for example the Siebensternbräu does some interesting experiments as well- they even make some Chili- and Hemp-beer. All in all I'm no beer drinker when at home but do guzzle it, too, when out and about or in company...
Other really excellent beers are from the Czech Republic: try Kozel or Budweiser, from Budvar, not the American version!- there are worlds between them, the U.S.-one tastes like coloured water with a bit of alcohol added to it!