Bluflame11, have a look at this thread, too, for some comments on attractions in the area.
Camping near or at Niagara Falls
If you're going to be there around the first of August, be aware that it's a long weekend on the weekend of Monday, August 4th so it will be busy and the campgrounds may have a rowdier crowd then.
Bissell's Hideaway is a popular resort-style campground as is Shekston Shores which is about 30-40 minutes from Niagara Falls, ON. I haven't been to Jellystone but they tend to be geared to younger children. The Niagara Falls KOA gets good reviews.
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)