Can't tell if you have a boat or not. If you do, follow the other boaters ... there are many great places to watch.
If you are a landlubber, you might want to drive down to Rockport at about 10:30AM, which is when the Race, er Run , is supposed to begin. All the boats will pass there at about 11AM going to Alexandria Bay. After they pass you can drive over the 1000 Islands Bridge to ABay and see the boats docked from 11AM to 1PM.