If you visit Montreal you must spend an afternoon in Old Montreal. There is plenty to see and do, there is a lot of history here as well as museums and theater. You can take a horse-drawn carriage ride to see some of the sites if you wish, but I think that walking on a nice day is better. You can go down to the edge of the St. Lawrence River to what we call The Old Port and see a few ships as well. There's a lot of dining options and cute boutiques, but since it is a touristy area you should be careful of paying a lot. In summer you will find street performers and artists, so stop by when the weather is warm!