Yes. You can feed monkeys by going into their home of natural habitats and eventually becoming a part of their family.
To make you wonder, there is an island exclusively for monkeys and its families. Monkey Beach is a breathtaking place, located on the southwest of Tonsai Bay. It’s a 150m long stretch consists of white powdery sands and clean waters.
You can offer fresh fruits like a banana, watermelon, etc. followed by seeds and flowers. They’re also fond of coconuts and nuts. But please ensure that the food is not choking them or causing any digestive problem.