They were all around Manuel Antonio national park and city of Quepos on the Pacific coast. I only saw the Squirrel Monkeys once there were three of them together. I never got to see a Howler but heard them a few times. The white face Monkeys were everywhere I saw them all over town on the roof of the hotel you would be sure to see them in that area. They are most active in the morning.
5DIV, Elan 7n, 400 f4 DO I, 100-400mm II, 1.4x TCIII, Tokina 16-28 F2.8, Tokina 12-28 f4, 85 f1.8, 50 f1.8 STM, Flashpoint 620m, YN14EX.
A7rIII, A6300, 100-400 GM, 85 f1.4 GM, 90 Macro, 55 f1.8, 16-35 F4, 35 f2.8, Batis 25 f2, Samyang 14 f2.8 AF, MC-11.
D500, 200-500, Tokina 300 f2.8, 35 f1.8
S110, D20, Hero 6, 3+