In reply to LudwikZdory:
France ...
Orgon, easily to reach from Marseille / Avignon on train, campsite / huts in the middle of the climbing area ... and all climbs to be reached on foot.
St. Victoire ... anywhere along the bus line Aix Puyloubier. No car needed.
St. Jeannet, staying in the gite, all sectors walkable. La Tourbie, staying in the village. Orpierre, once you are there ... all are areas that keep you busy for a week at least.
Osp in Slovenia - everything walkable from the campsite.
Italy ... Sperlonga, staying on the central plain ... and Ferentillo, staying in the village.
Portugal ... Cascais ...