In March, we decided to go visit Niagara Falls State Park since we thought it would be interesting to see Niagara Falls on the USA side since we always see it from ours.
Niagara Falls from USA at the Observation Tower
Niagara Falls State Park is the oldest state park in USA dating back to 1885. Since we went during winter, there were a number of things that we under construction or blocked off due to weather. So, while we did not see everything, we saw about 90% of what I expected to see. We took a little under 2 hours to walk through the park. This consisted of us going to the visitor's centre, observation tower, prospect point, terrapin point and the three sisters islands.
Based on what we saw, I would say just stick to the Niagara Falls portion of the park because I felt that the Three Sisters Islands weren't very interesting, but the other four points are worth visiting for the views and they aren't very far apart (although on the map, it may seem like they are).
Rainbow with Rainbow Bridge!
While it was interesting to see the falls from the USA
side, I can see why people like viewing it from Canada. If you are in the area though, to get to the state park, all you need to do is cross on foot
at the Rainbow Bridge and once you have cleared customs, you are in the
state park. The park is free and there is parking available (lots 2 and
3 are free, lot 1 is $10). I wouldn't go out of my way to visit, but if you are
near, it is worth a stop just to see what it is like.