What a wonderful time wandering in Old Quebec City ! My home town is such a nice place, and I highly recommend tourists to visit Old Quebec. You can start at Place D'Youville (Ice rink outside in Winter) and then head over to rue St-Jean. You will be able to admire the St-Jean Doors at the entrance, and then shop in many littles boutiques on the street. Then you can continue on Côte de la Fabrique, and you'll be really close to Château Frontenac and Terrasse Dufferin, where you can admire the St-Lawrence River!
Have a wonderful time!