I had the chance to spend a day with my Dad for a late Father's day and we visited the Maid of the Mist in Niagara Falls. We had a great time and I recommend it as a fun family activity!
So here are a few of the things that are local and great for families see if you can check off any of the following on your list, or add some new ones to mine, I have added links if possible.
Old Fort Niagara
Local Farms for fruit/veggie picking ( Browns Berry Patch, Blackmans, Becker Farms)
Local Beaches (Beaver Island, Bennett Beach, Sunset Bay, Crystal Beach CA)
Albright Knox Art Gallery
Shakespeare In The Park
ArtPark Free Family Events
Enjoy your family and enjoy your time off!