Niagara Glen

The Niagara Glen (aka the best Glen ever) is a great spot near Niagara Falls for hiking, picnicking, relaxing, etc...

It is a forested area, full of walking paths, rocks to climb on and you can even walk right down to the Niagara River. You're not supposed to swim there, but you can definitely stick your feet in the water and cool down. 

It's not quite as well known as some of the other attractions in Niagara, but it's well worth a visit.