You can start from the Grand Hotel Cadenabbia, next to Villa Carlotta, there is a large free parking. Immediately after the hotel, turn into a narrow street and start climbing the ladder upwards and follow the signs, at the top you will get to the road called "Adenauer's Walk". Könrad Adenauer, Germany's first chancellor, lived in Griante in the Villa Collina.
The road to the top is picturesque, from the top point you can see both "legs" of the lake.
The time to rise is 40 minutes.
It's better to take everything with you for a picnic, upstairs there are benches and tables.