Photo: GetYourGuideThis best-selling day trip runs from Toronto to the thundering Niagara Falls, with a boat cruise to the foot of the falls and the Journey Behind the Falls tunnels, plus time in Niagara-on-the-Lake or the wine country on many itineraries. It is a long but unforgettable day. Bring a waterproof layer for the boat, wear comfortable shoes, and have your camera ready for the Horseshoe Falls.