We were here several years ago and remembered the American side being dull with all the excitement in Canada. Without a passport or birth certificate for our four year old that wasn't an option this time which gave us the opportunity to re-experience the American side and we were not disappointed. They've recently relandscaped Luna Island and the Three Sisters Islands areas to enhance the natural beauty. The latter has several areas where you can get right down by the water near the rapids to appreciate their force firsthand. Even the pedestrian bridge to Goat Island helps instill the power at play here. In addition to being walkable there's a trolley that stops at most of the places you'd want to visit. And there's a package available which includes Maid of the Mists, Cave of the Winds, the Observation Tower (great for watching the light show and fireworks), the Aquarium and Gorge Museum, the Adventure Movie, and also a days ride on the trolley.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.