The Brenta runs along the Valsugana valley, from about Trento to the Adriatic Sea, in the laguna near Venice. Right now the cycling path runs from Pergine Valsugana to Bassano del Grappa. More than a real cyclists-only path, it is really an itinerary that exploits backroads with little or none motorized traffic. There will be train or bus transportation back to the point of departure.
Phone numbers are long-distance within Italy.