It's a very beautiful walk on the CAI trail n° 24.
Go to the Cainallo refuge by car, GET the parking ticket (2 euros for the whole day) and then keep driving on the dirt road until you reach an opening on a meadow. Leave the car here and start rising on the left inside a wood . The path is quite easy to walk , partially inside the wood, showing the landscape on the valley . After 1.5 km you'll reach the fork to the refuge Bogani , go right on the sharp rise. On the top, you'll see for the first time the Lecco lake , it's really a wonderful panorama!
Keep walking on the trail toward this small church and the "Arco di porta Prada" , a sort of natural artwork, really impressive. From now on there is a short descending section and then a smooth rise on the hillside, leading to the Bietti refuge . The refuge is on a nice opening where you can see a part of the lake . We walked for a total of 4.5 km with a difference in altitude of about 300 meters uphill (one way)
Cainallo refuge website: http://www.cainallo.it (Italian language)
Bietti refuge website: http://www.rifugiobiettibuzzi.it/
Point of interest: "Arco di porta Prada", "Lecco" lake panorama, Bietti refuge
Difficulty: Medium/low
Difference in height: 350 m
Maximum height: 1720 metri
Length: 9 km return trip
Duration of journey: 3-4 hours
Suggested season: Summer
Technical equipment : Required