You say 'family' so I am assuming kids. How old are they and what are your interests?
Plenty of wineries in Niagara not too far from the Falls.
Clifton Hill is a busy place with arcades, and other stuff to do.
Wild Bird Kingdom is a cool place and is a short walk north of the falls.
Someone may have mentioned the new Niagara Parks Generating Station that just opened up.
Avoid some of the restaurants right in the tourist area as they will take your house.
If you don't mind leaving your kids to run around the parking lot for a few hours there's the casino. Just don't get caught.
Niagara On The Lake (NOTL) is nice to stroll around and go through the shops. Though it can be busy on weekends. The NOTL golf course has a nice restaurant overlooking where the Niagara River flows into Lake Ontario.
There are jet boat rides that run out of NOTL as well. They run the lower Niagara River and can be pretty exciting.
If the kids like go-carts and mini-putt then go to Go-Karts Niagara. Buy tickets online for a better deal -
https://www.gokartsniagara.com/ Do not go to the Niagara Speedway as it is a small fortune.
Plenty of nice golf courses run by Niagara Parks as well as others throughout the area.
The Niagara Botanical Gardens also has a butterfly conservatory.
That's all I got!