By the car:
A2 Hannover - Dortmund: Exit Rehren or Lauenau, continue to Hamelin, in Hamelin on the B1 direction Aerzen, in Groß Berkel follow the signs "Hotelroute" Waldquelle.
A44 Dortmund - Kassel: Exit Warburg, via Brakel to Blomberg, follow the B1 to Aerzen, follow the signs "Hotelroute" Waldquelle.
Exit Bühren, direction Paderborn on the B1 and follow this until Aerzen, follow the signs "Hotelroute" Waldquelle.