Yes, you can walk from the American side to the Canadian side of Niagara Falls via the Rainbow Bridge. The walk takes approximately 10 to 15 minutes and offers one of the most spectacular, high-fidelity views of both the American and Horseshoe Falls. To cross, you must have a valid passport (or an Enhanced Driver's License for U.S. residents of certain states); you will pass through a pedestrian turnstile on the U.S. side (which requires a small toll of roughly $1.00 USD/CAD in quarters or by card) and then clear Canadian Customs and Immigration on the other side. The return trip involves passing through U.S. Customs. The bridge is open 24/7 to pedestrians, and it is a favorite for tourists who want to stay in New York but see the famous "Canadian view" or visit the casinos in Ontario. Just remember that once you cross, you are in a different country, so ensure you have the correct travel documents and any necessary visas for your nationality.