To get to grips with Provence's most prestigious crop, this excellent eco-museum makes an ideal first stop. An audioguide and video (in English) explain the lavender harvest, and giant copper stills reveal extraction methods. Afterwards you can take a guided tour of the fields at 1pm and 5pm daily May to September. The on-site boutique is an excellent (if pricey) one-stop shop for top-quality lavender products.
There's also a picnic area in the lavender-festooned garden.