Hi Adrian...

My wife and I did a similar (identical?!) trip lasting 3 weeks. From England, through Germany and onto Prague. Then Poland and Slovakia and back to Prague and then home.

We kept a blog of the trip at Jon's adventure blog.

For the trip though Germany I stopped at Monschau (very beautiful town) and then took a small trip over the the Nurburgring. (If you drive to the town of Nurburg and then head out a bit towards the forest you can park up and go to the old stands and get an excellent view of the crazy cars and bikes).

Prague was great, but there are a lot of brits out on stag nights, etc.

From Prague we headed to the Church of Bones (at Kutna Hora) - only a short hop. We only did this because of the Long Way Round connection and met some Russians on a Pan (like ours) who'd read the book and made a similar trip but from Moscow! From there we headed North-East to Pec Pod Sněžkou on the Czech/Poland border (in the Krkonose Mountains region). Very beautiful, excellent roads, very cheap.

In Poland we took in Wroclaw - very nice, Krakow (bigger tan Wroclaw but a little more touristy), and then over to Zakopane in the Tatras. The days before and after Zakopane and the Tatras were by far the best for the driving. The roads and scenery were awesome.

From there into Slovakia - by chance we came upon a great Pension on the trip from Zakopane (mentioned in the blog) with more awesome views. From there to Bratislava - very nice, but still just a big city. Then we went back to Prague via Austria, and from Prague back home.

Good luck with your trip.

PS - I bought the Garmin Zumo 550 for the trip - absolutely fabulous apart from limited coverage of Slovakia.

Jon.