Doi Nangmo is a peak 35 km from Chiang Mai (about 40 minutes).
The path leading to the summit is 2.6 km which may not seem like much, but there is 560 m of elevation gain. The path is quite steep at times and quite slippery when approaching the summit due to pebbles and small stones.
It is possible to return by the same path or to continue for a longer hike
Google map : https://goo.gl/maps/mDru3hEVecHz62PW8
GPS track of the hike : https://www.alltrails.com/fr/randonnee/thailand/chiang-mai/nangmo-mountain
Start of the hike : https://goo.gl/maps/NSycBwrH6q12SXWz7
GPS coordinates of the start of the hike : 18.72051, 99.23303
The view from the top is clear and worth the detour.