If you are in it for the beer, Oktoberfest is not a must. Only six brands of beer - those that historically brew from Munich water - are selling there. Those are also the breweries that dominate the wonderful Biergärten, so no big variety there neither. But there are bars that specialize in offering more brands and types and of course you can visit breweries. Andechs monastery - been there on Saturday - is beautiful but there is probably hundreds of breweries of all sizes that offer tours.