Gréoux-les-Bains is an ancient Roman town with thermal baths, located nearby the Verdon Gorge. The old center has pedestrian streets lined with small shops, outdoor stalls and restaurants. The ancient Templier chateau dates from the 12th century, with building or restoration in later centuries.
There is really no problem with parking the car in the town. We can choose a really big parking lot at the Avenue des Marronniers (GPS: 43.758515, 5.885850), and also a quite large parking lot at the Avenue des Aires (GPS: 43.757266, 5.883994) located on the southern side of the town. You can also park the car in the parking lot at Avenue Pierre Brossolette (GPS: 43.757576, 5.885769). Every kind under the sun! ;)
We parked the car in the first parking lot mentioned above, and then went down the Grande Rue street towards the town center (Place de L'Hotel de Ville), where we found the mayor's office, the office of tourism and interesting church of Notre-Dame-des-Ormeaux from the thirteenth century (A; GPS: 43.758141, 5.883566) - the former convent of the Montmajour abbey. We walked a while narrow streets of the old town, then went Rue des Templiers slightly uphill looking for the Templar castle from twelfth century (B; GPS: 43.759837, 5.883690). This castle was built on a rectangular plan and includes two additional towers. If you want you can also drive to the castle itself and stop on a small parking lot (GPS: 43.760539, 5.884184).