Did the mountain alone in a short two day trip. Started in early afternoon from Chiang Dao, camped before the peak and summited by sunrise. Very beautiful mountain. Plateau in between the ridges quite unique. Guide was supposedly mandatory, though the guards at the park's entrance showed no objection to let pass myself.

Full trip report + map:
http://dimitriosfan.com/2016/02/02/doi-chiang-dao-thailands-third-highest-mountain/