If you're going to the Falls, take the WeGo bus. It stops right in front if the KOA. No parking at the falls. WeGo passes come as part of an Adventure Pkg they sell at the KoA also.
Great location, short drive to Niagara Falls. This KOA is near traintracks. If you have a site near the back be aware you may wake up in the early morning to a freight train going by.