Hey
If you are planing to come along with your car from calais, it would be the best route to start in the south.
Here is a link where you can change the route how it fits best to your plans:
http://maps.google.com/maps?f=d&source=s_d&saddr=Europa+park+rust&daddr=Tripsdrill+to:Holiday+Park,+67454+Ha%C3%9Floch,+Bad+D%C3%BCrkheim,+Rheinland-Pfalz,+Deutschland+to:Heide+park+soltau+to:Movie+Park+Germany,+Warner+Allee+1,+46244+Bottrop,+Bottrop,+Nordrhein-Westfalen,+Deutschland+to:Berggeiststr.+31+-+41,+50321+Br%C3%BChl,+Germany&hl=de&geocode=%3B%3B%3B%3BFTasEwMdxWVqACGKfjR5beq3Zg%3B&mra=ls&doflg=ptm&sll=51.488224,6.339111&sspn=4.926336,9.887695&ie=UTF8&ll=50.63901,8.492432&spn=5.017431,9.887695&z=7