Getting to the Base Nautique CNW and youthwake.lu by car is fairly easy:

Take the Highway A1/E44 - Direction to Trier/Germany
Take exit 14-Mertert/Wasserbillig
After 800 meters turn left at N1 - direction Mertert/Wasserbillig
After approximately 1.5km go straight through the traffic circle
After another 1.5km you will see the parking of the "Centre Culturel" on your right, and the parking of the trainstation on your right.

Park on either one of those and walk towards the main building of the trainstation. There you will see a tunnel passing the rail tracks, take it, and you're there :)!

OR! Just type it into your GPS:

1, Grand-Rue
6630 Wasserbillig
Luxembourg

Check out the CFL website for connections from your nearest trainstation:
CFL Timetable for July 13th, 2010

Go to vdl.lu,
enter your place of departure into the field "DE",
enter "Wasserbillig Gare" into the field "À",
enter the date you booked to come into the field "Date",
and your departure time into "Heure" and you are ready to go :)