Arboretum de la Fôt
There is a small but well stocked Arboretum near Noth (next to the Chateau de la Cazine) which is free and well worth a visit. There is easy parking nearby and although it is on the side of a hill, the gradients aren't too bad
There is a map of the layout showing paths and trees.
Each type has a group of several specimens and its own clear label showing the French and Latin names.
The paths are wide and flat and it a fairly gentle walk in the main (although some paths are steep).