• drive on the auto barn( however long it takes )

Most barns are not more than 20m in length so you should be able to cover it in under a minute. No idea how to get a car on top of a barn though.

autobahn* haha
ill probably jump the car onto the roof of the barn,only possible way i can see how.

Amsterdam to Cologne: Train. Book at http://www.bahn.co.uk in advance (ie now) for cheapest prices

Cologne to Munich: Train or plane. Book at http://www.bahn.co.uk or http://www.lufthansa.co.uk. However, you may wish to rent a car one way to drive the autobahn. The major players are Hertz, Avis, Sixt and Europcar.

Re driving on the Nurburgring, which is relatively close to Cologne, hire car companies expressly forbid it, for obvious reasons. You can hire a racing car to drive it (see http://www.nuerburgring.de/en/drives-fun/drives/car-rentals.html) or get a lift in the Ring Taxi which is a race tuned BMW driven by a professional driver (see http://www.nuerburgring.de/en/drives-fun/drives/co-pilot-rides/bmw-ring-taxi.html).

For Oktoberfest, take a lot of money. Prices this year for a litre of beer are €8.30 to €8.60 a go. There tends to be an unwritten expectation that you'll tip the waitress the change from ten euros; failure to do so will leave you with an incredibly busy waitress whenever you want a new one. If you need accommodation (I assume you do), you need to book immediately; many places will be booked out by now.

hallo freunds
i think i typed that right from memory haha

Haha. No, you didn't.

after my contiki trip in september, i plan on exploring germany for a about 3 or 4 days,
can anyone tell me if my objectives are achieveable?
- check out the cathedral in cologne
- expirience oktoberfest ( 1 day + 1/2 day recovery haha)
- drive on the auto barn( however long it takes )
- drive on the nurburgring track

Yes. Doable, just leave enough time between the drinking and the driving parts. Haha.

what is the best way to travel in germany (amsterdam to cologne then from cologne to munich?)

I am just on my way home from Amsterdam and half an hour ago it was located in the Netherlands, not Germany. Haha.
But if your Contiki trip ends in A'dam and you want to visit Cologne next, it would make sense to take a direct train.

also does anybody else have some suggestions about some must see locations and expiriences?

Care to share your interests, apart from drinking and fast driving?

wha

Whaha.

You seem to be interested in cars, why not visit Stuttgart where they were invented and still commercialized? The Mercedes Benz Museum is probably the largest and best car museum in the world, and the Porsche Museum is also excellent. Perhaps you'd like to visit the Porsche or Mercedes Benz assembly plants. If your visit is late enough in September you can visit the Cannstatter Volksfest ( http://www.cannstatter-volksfest.de ) instead of Oktoberfest. It's the world's second largest beer festival and at the same time the world's largest fun festival. Unlike Munich where hotel prices will triple if a room can be found, most hotels in Stutttgart only moderately raise their prices at this time with the exception of a few hotels very close to the fairgrounds. It will also be more authentic with mainly locals instead of the vast number of foreign tourists that Oktoberfest attracts. For ideas of things to do in and around Stuttgart, have a look at what I wrote in #1 of http://www.tripadvisor.com/ShowTopic-g187275-i116-k6068438-Stuttgart_as_a_base-Germany.html#49932873 .

Train is the best way to travel in Germany, in my opinion. Just last month we did Prague, Dresden, Berlin, Cologne and Amsterdam by train. , in first class, although second class is were everyone seems to prefer. The Cathedral in Cologne is impressive, always open but many sections were closed at different hours. It is located strategically , next to the Central train Station. Nothing else was extraordinary , besides a walk along the river, but not the boat ride or the Hopon-Hopoff tour bus.. Yes, streets were plugged with tourists . However we would not have missed seeing Cologne for a third time!!

#6 You didn't visit the Roman museum next to the cathedral?

7 , I did not but my wife thought I missed a nice museum.