Maastricht Airport
Six miles north of the city center, Maastricht's Aachen Airport has several car rental outlets, including National, Hertz, Europcar and Car Hire 3000. National's Dutch fleet includes minivans like the Peugeot 807 and light trucks such as the Volkswagen Caddy, as well as sporty options like the Opel Astra TwinTop and Mercedes-Benz SLK convertibles.
Maastricht Train Station
Avis and Thrifty have offices within a short walk from Maastricht's main train station, as does local firm Autoverhuur Adrem Limburg, which also offers airport pickup. All three rent station wagons, minivans and even delivery vans to carry equipment for an outdoor adventure, and Adrem Limburg offers "special cars," like the Citroen Le Patron convertible kit car.
Randwyck Station
National has another branch in the area around Maastricht's other train terminal, the Randwyk Station. Europcar, with a large fleet of cars, station wagons and minivans, is also nearby at the interchange of the E25 and N278 highways.
Nearby
The closest auto rental outfit to Valkenburg is AutoRent La Blanche, located on the N590 highway, 5 miles west.
Heerlen
The town of Heerlen, 9 miles east of Valkenburg, is home to yet another National branch. It's also served by Auto Rent Bastiaans, conveniently located next to the main train station.