Can I see Niagara Falls for free?
Yes, you can see Niagara Falls for free. The main viewpoint on the American side, Prospect Point, is completely open to the public with no ticket required. You can walk right up to the railing and get blasted by mist for free. Same goes for the Canadian side's Queen Victoria Park—you can stroll the entire promenade along the gorge and see both the American and Horseshoe Falls without paying a cent. Parking is the real cost, so if you can walk from your hotel or take the local bus, you're golden.
If you want to actually get on the water or behind the falls, that's where the money comes in. The Maid of the Mist boat ride is about $30 USD per person, and Journey Behind the Falls is around $25 CAD. Both are worth it if you want the full experience, but if you're just here for the view and a photo, skip them. The free viewing areas are honestly better than most paid attractions in other cities.
One pro tip: the Illumination of the Falls at night is also free, and they do fireworks in the summer. So bring a jacket, grab a spot on the Canadian side, and you've got a world-class show for zero dollars. Just don't fall for the overpriced "observation towers" or the cheesy souvenir shops—they're a waste unless you really want that "I heart Niagara" t-shirt.