Chiang Mai Birding
Doi Intanon Birding
Many people claim the best time of year to go bird watching in Doi Intanon is between December and February. Largely because at this time you get to see migratory birds fleeing harsh winters as well as the resident species.
Weather is reliably cool with no rain, which means camping is a feasible alternative to staying in a park bungalow. Tents and blankets can be rented from park headquarters. They also have a detailed bird list with photos.
To get to Malee's by bus you will need to go to the Chang Puak (white elephant) bus station and get a bus to Fang. You will need to alight at the turn off to the Chiang Dao Caves (if you're coming from Chiang Mai then this turn off is at the far end of Chiang Dao town). Just tell the bus driver you're going to the Chiang Dao caves and he should get you off at the right turnoff (apparently this is where most foreigners get off).
From this turnoff take a motorcycle taxi (no more than 40 baht) to Malee's place, which is about 2 km beyond the Chiang Dao Caves. (The caves are about 6 km outside Chiang Dao town.)
Lots more about Chiang Mai birding at digdeep1962.blogspot.com