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Best answer
10
One long day works — Green Bus from Arcade 3hr to Chiang Rai (~200 baht), or join a minivan tour 800–1,200 baht. White Temple (Wat Rong Khun) 100 baht, 1–2 hrs; Blue Temple 20 min; Black House/Baan Dam 200 baht afternoon. Start 7am from CM, back by 8pm tired but doable. Overnight Chiang Rai nicer if you hate bus time. Skip on burning season haze days — views flat.
3
White Temple bathroom is wild — budget 10 min for photos there alone.
2
Hired driver split 3 ways — 2,500 baht, flexible stops at Singha Park.