I’m an American. I spent a university year in Germany, worked there for several years after graduation, married a German and, even though we’re living in the States now, hubby and I keep an apartment in Germany that we visit once or twice a year. Some thoughts:
Start in Munich. Avoid Oktoberfest, which, as you probably know, is actually held in September. It’s peak tourist season and the city is hideously overcrowded and the prices are jacked up at hotels and restaurant. The city is full of drunks and if you don’t like stepping in puddles of vomit, avoid Oktoberfest. Munich is a beautiful city and well worth seeing, but I’d recommend visiting it in the spring. If you love art, the Alte Pinakothek is one of the world’s great museums. More info at: http://www.pinakothek.de/alte-pinakothek/museum/museum_index_en.php
In Munich, rent a car and travel into the Bavarian countryside to see some of Mad Ludwig’s castles. Neuschwanstein is the most famous http://goeurope.about.com/cs/germany/p/ludwig_castle.htm It’s garish but worth seeing. Ludwig II also built other royal residences, including Linderhof, a small perfect gem of a castle, exquisite in every detail. I recommend it. You can visit Oberammergau if you’re driving through Bavaria. Be sure to pick up some wood carvings.
Another wonderful place is the Andechs Monestery just outside of Munich. The monks there brew beer. It’s fabulous beer, memorable beer. It is beer to make you praise God and thank Him you were born. It is, I’m convinced, the beer that’s served in heaven. http://www.andechs.de/englisch/brauerei/ The German drunk driving laws are very strict and the police don’t show mercy to tipsy drivers, so take care if you drive. There’s a train from the city, but you have to climb a very steep hill to reach the monastery.
The Black Forest is just that - a forest. I mean, it’s nice and it’s pictureseque but we have woods here in the US. If you’re short on time, skip it and head for the Rhineland after you leave Bavaria. I’d recommend getting a Eurail Pass and taking the train to the western part of Germany.
Give Frankfurt a miss. It’s archtecturally undistinguished; the city was flattened in the war and most of what you see is modern construction. Unless you’re a Goethe fan. If you are, let me know and I’ll give you info about the Goethe house.
Be sure not to miss Cologne. The Cathedral there is one of the glories of Western Europe. After you leave the Cathedral, go next door to the Roman Museum, which features artifacts from the Roman occupation. There are fragile glass vessels dating from the First Century A.D. that are marvelous to behold.
After Cologne, take the train to Koblenz, a small, pleasant city on the confluence of the Rhein and Mosel Rivers. In Koblenz, board any of the several sightseeing boats that sial up and down the most scenic part of the Rhine. You don’t need a reservation on the boats and there are ticket booths on the Rhine quay. The boats go past the Lorelei cliff, wonderful castles, vineyards and medieval towns. You’ll love it, I guarantee. The boats have restaurants on board.
Oh dear, now I’m pining for Germany. I’m going to go pour myself a Sam Adams (the closet thing you can get to fresh German beer in the States) put on my dirndl and sing Volkslieder.