In a bowl of a stand mixer fitted with a paddle attachment, cream together the butter, brown sugar, and white sugar until smooth. Beat in the eggs 1 at a time, and then stir in the milk and vanilla. In a separate bowl, combine the flour, baking soda, and salt. Mix the flour mixture into the sugar mixture just until combined. Stir in the oats, chocolate chips, and coconut. Drop by rounded tablespoons onto an ungreased cookie sheet. Bake 10 to 12 minutes. Cool slightly on the pan before transferring to a cooling rack to cool completely.