In a large bowl, mix the oats, coconut, flour, and sugar to combine.
In a medium heavy saucepan, stir the butter and syrup over low heat until the butter is melted. Remove the saucepan from the heat. In a small bowl, stir the water and baking soda together, and stir into the butter mixture. Stir into the flour mixture.
Using 1 tablespoon dough for each cookie, drop 12 mounds of dough onto each baking sheet, spacing them evenly. Do not crowd the cookies, as they will spread considerably.
Bake the cookies, switching the positions of the sheets from top to bottom and front to back halfway through baking, for about 15 minutes, or until golden brown. Let cool on the baking sheet for 5 minutes.
Transfer the cookies to wire racks and let cool completely. The cookies will become slightly crisp and chewy once cooled. Repeat with the remaining dough, being sure that the baking sheets are completely cooled before adding the dough.