Another place for monkeys is Khao To Sae (what I call Monkey Hill) - this is the big hill in Phuket town with all the aerials on top. Near the top is a big troop of monkeys and people come to feed them. In the late afternoon, lots of locals use the hill for exercise. It's a steep climb! You can drive up too if you are lazy, or drive half way to the temple and walk from there.
More on this hill:
Monkey Hill (on my blog)