Train: Take the IC / ICE from Hannover or Berlin to the Wolfsburg-Hauptbahnhof (main station). From there take a Taxi (7,00 ?) or bus 209 and 219 (also from ZOB the central bus station), to the stop ?Steimkerberg?.
Plane: From the Langenhagen Hannover Airport, take Direkteinstieg S5, 12 min. to Hannover Hauptbahnhof (Hannover main station) and then the IC / ICE / RE Train (30 to 45 min) to the Wolfsburg-Hauptbahnhof (Wolfsburg main station). From there, take a Taxi (9,00 ?) to the Parkhotel.
From the airport by rental car (We can reserve a rental car for you from the airport): From the airport follow signs for Berlin, take A2 to the highway triangle Wolfsburg/Königslutter (continue as described above).