You can enter into Pincio Gardens through the Villa Borghese. Both are large parks with tree lined streets filled with people, adjacent to each other. Villa Borghese tends to be a little bit busier because it is larger, better known, and has other attractions like the Galleria. People wonder through both all day long, especially on their bikes. You know you have entered into Pincio Gardens when the streets become lined with the familiar marble busts.