Niagara Falls is beautiful, whether you visit the Canadian side or the American side. For the most complete view you need to do both. A passport is NOT necessary to cross the border, yet! This awesome destination can be viewed from all angles and there are plenty of attractions to give you great exposure to the gigantic falls.
The wonderful advantage of visiting the Falls, is that there is so much more to participate in besides just seeing the Falls. On the American side you can see reenactments at Fort Niagara, which guards the mouth of the Niagara. A visit to the Power Vista shows how the water is used to create massive of electric power for large parts of North America. On the Canadian side, there are vineyards, wineries, botanical gardens (tended by the School of Horticulture), War of 1812 venues along with Fort George, historic Niagara-on-the-Lake with its shops, boutiques, spas and fine restaurants. You can get authentic British fish and chips in a British pub or take a carriage ride through town. For theater lovers, the wonderful Shaw Festival is a "must visit" There are water parks, golf courses, fishing, hiking, biking to compliment the geological wonder of this area. Top the whole thing off with a little gambling at one or all of the three local casinos (two in Canada and one in the USA).
Plenty of motorcoach tours of the area are available, which include visits to a variety of attractions. But for the budget minded and independent traveler, there is also a driving tour available. Just play the 2CDs in your own car and follow the directions for a delightful excursion. You have the freedom to go on your own time and at your own pace. You can visit everything or just the places you want. It is available, for sale on the Internet so you can have it with you when you arrive. Keep the CDs to replay when you get home and view a photo album, on your PC, which also come with it. Some think that fuel prices are a deterrent to taking a driving tour, but the whole thing can be done on just a couple of gallons of gas.
Niagara Falls is a destination which has something for everyone and if you plan carefully you can find ways to see and do everything without breaking the bank!
