Get your passports (or passport cards). While they may not be required for entry to Canada, it will simplify the crossing, and THEY ARE REQUIRED for re-entry to the U.S.
There are many things to see and do on the Niagara River Parkway.
Niagara Parks. If your interest in history, there is old Fort Erie, Old Fort Niagara and old Fort George, all along the Niagara River. "will hike, do museums and love walking around little towns to see the shops and ice cream places!" Niagara on the Lake is the ideal town for that. and that just a small portion of to do things in the Niagara area.
Also in southern Ontario are many sand beaches on Lake Huron, Georgian Bay. Bruce peninsula for hiking sites.
Beverley and Ken