Wally Walnut Walk is in Diósd, close to quarry: Route planning
Line 13, 725, 727 at "Diósd, Valéria utca". Or line 13A, 88, 113, 710, 712, 715, 720, 722 at "Diósd, Sashegyi út" stop, but that is a bit far from the WWW.
Waze and Google Maps knows, where to find us. Search for "Dió Döme sétálója".