Just did the same kinda of trip.
We do it as a family every Christmas and New year, however this year we decided to go early and come back home just north of Bangkok before New Year.
Did Doi Suthep camping 2 nights, this was on the 22nd so we were the only people there...
Then we went to Chiang Rai for 2 nights, stayed in a hotel in the center, did the usual things around there.
Then cam back to CM, visited a friend in San Khanpheang for a night
Then went off to Doi Inthanon for a night camping, Kilometer 26 turn left down a steep small lane and there is a wonderful little camping place on the right as you go up the hill, it's next to a small stream.
Did the usual there, a bit like the OP, then headed to CM for one night in a hotel, near the night bazaar and back home...