The Parc d'Isle is big (47.52 hectares). It contains lakes, marshes, orientation course, a farm, and other environmentaly-friendly areas. Entrance is free.
Despite the blustery, wet weather, we managed an hour's walk along the main footpath (through the topiary) before the rain swept in again.
This is a wonderful resource, right on our doorstep (gunwales) and something we mean to make more use of during our visits to the boat.