Our family of three went on a lengthy summer road trip through Canada and the US in 2012, and this was definitely the highlight. You could spend hours in Canal Park just looking out at the gorgeous lake and bridge. I highly recommend the Lakewalk, as it is a great stroll along the beach and offers several different outstanding vantage points of the bridge. The bridge is particularly beautiful at sunset, and definitely do the Lakewalk at this time if you can. I also recommend crossing the bridge and spending some time on Park Point Beach, where the sand is amazingly soft and you also have a nice view of the bridge. Also, if you can get a hotel in Canal Park, you should definitely get a room with a Bridge view, as it is a truly special experience to sit in your room and watch huge ships pass under the bridge onto Lake Superior.