There are numerous other waterfalls in western New York all much smaller, notably the 3 falls of the Genesee River within Letchworth State Park. Old Fort Niagara, a historical site, is around half an hour to the north, and Buffalo is about half an hour away.
You can travel to the Canadian side for a closer view of Horseshoe Falls and to visit the other attractions in Niagara Falls, Ontario and Niagara on the Lake, although you will need a passport or another document proving both identity and citizenship, the main Canada article covers documentation requirements and crossing the border by land in depth.
Lewiston is just to the north, and is usually visited as part of a trip to the Falls. Lewiston's Artpark State Park has a popular open-air auditorium in addition to the normal park activities. Lewiston also has The SandDocks and the Niagara Escarpment on Lewiston Rd.
