Be aware of the guesthouses in Chiang Mai.There are a lot of scams. worst of all Thailand.
Never leave your creditcard in the hotel safe, even when trekking for a few days. They will get it out, do some shopping, the....put it back before you arrive! You don't know about anything, don't fill in a complaint and you get the bill when you get home.
I was smart enough I thought, because I knew this trick, but they came at night in the room to robe me. D'ont know the name of this guesthouse, but it was not far from the old wall, next to the canal.
Now when I go back I am looking for a hotel with a view on the river, to watch the festivities.