Waisila Falls is a small 15m waterfall deep in the Colo-i-Suva Forest Park on the northern outskirts of the capital city of Suva. You can walk to it either from the back side of the park or the front side. There is an admission fee for the park, which is payable at the visitor center. The walk probably takes about 15 minutes each way if you're coming in from the back side of the park.