Originally Posted by Hydro Junkie

If you're into history, you might want to check out the HMCS Sackville on the Halifax waterfront. She is the last surviving Flower class corvette and is moored just outside of the naval base in Halifax.
If you want to see a natural oddity, while you're in St Johns, you should check out the "Reversing Falls". At high tide, the falls are completely under water and the river actually runs away from the harbor. As the tide begins to go out, the river starts flowing back toward the harbor and the falls reappear. It's actually fun to watch the water change directions and the rock formations slowly rise out of the water as the tide goes out. Just a couple of suggestions though I would recommend you don't go to either place when a cruise ship is in port as it tends to get a little crowded. BTW, the Sackville gets moved into the naval base for the winter and during times of inclement weather as the wife and I discovered when we were in Halifax just prior to Hurricane Sandy hitting the area in late October 2012. We "rode out" the storm in Quincy Massachusetts before seeing some of the damage it caused across that state as well as Connecticut and Rhode Island.