Colorado Provencal is one of the favorite hiking spot. It is in the same range as Roussillon. But it is much larger. Another advantage is you will meet much less tourists.
Located in Rustrel, 30 min from Mas des Etoiles. You have several itineraries between one and two hours. It is not difficult.
To get there, you go up to the Gordes round-about on D2 and you drive further to Saint Saturnin les Apt. Rustrel is the next village.
The road D2 is very nice and yo also have good views on the valley and on th Luberon Range ( Moure Nêgre 1,300 meters high)