From Bolzano-Trento, from Trieste-Venezia and from Firenze-Bologna:
Exit A22 "Affi-Lago di Garda Sud", follow the signs for Bardolino. Then follow the detailed map here down.
From Torino-Milano:
Exit A4 "Peschiera del Garda", follow the signs for Bardolino. Then follow the detailed map here down.