I've just helped my friend book this for her husband and it looks a great day. Any Top Gear fans will be familiar with the Nürburgring and this looks a great experience.
I've combined a deal with http://www.grouon.de
where you get to experience the Nürburgring with a pro and also get to drive a couple of laps yourself *please read the terms and conditions carefully as there is some additional options regarding insurance because you are driving a race car on an actual race track!! I also suggest getting the date confirmed with the company before booking flights and hotels which we did first.
This deal is based on 2 adults (only one person will experience the Nürburgring but you can buy a package for each person if you wish). I've based this flying from London to Cologne on 17th March and returning on 20th March, a nice long weekend break.
I've included a hire car as you'll need it to drive from Cologne to Nürburgring which is 1 hr away, a straightforward drive. You won't be able to take the hire car onto the race track! The hotel is the lovely 4* Novum Silence which although on the outskirts of Cologne is near public transport if you didn't want to drive into the city.http://www.tripadvisor.co.uk/Hotel_Review-g187371-d232666-Reviews-Novum_Hotel_Silence_Garden_Cologne_Brueck-Cologne_North_Rhine_Westphalia.html
Book flights with Ryanair £39.96
Book care hire on http://www.vehicle-rent.com
Book 17-20th March at the Novum Hotel Silence Garden on Ebookers using code AFFCLOUD0217 £118.60
Book driving experience on http://www.groupon.de
using code NEU25 €84/£71.76