Boston – Montreal trip

I had sought insights for my family’s trip to Vancouver at TR. I gathered some fine points for that trip.
(See: https://www.techrepublic.com.com/5208-6230-0.html?forumID=8&threadID=200700)

This time I need some suggestions for sight-seeing in Montreal. We (two families) are driving from Boston to Montreal. 3 nights in Montreal. I have got maps and tour books from AAA, yet to look into them.

What would you recommend for a family/kids friendly sight-seeing and experience?

thanks.