Hi all
We will get to Venice tomorrow mid afternoon
Staying 3 nights
Leaving very early morning last day
Any recommendation of what to do?
Where to eat, etc for family of 4?
Kids ages ar 11 and 13
Start with one of these tours.
http://www.venicefreetours.com
Popular sites include the Rialto Bridge and market, st. Mark's Basilica, the Doges Palace.
More info here.
Have you got the guidebook? If not you can download it as a Kindle. Loads of good info for exactly your questions.
Go to a "Tourist Information" location or ask your hotel for suggestions/answers for all of your questions
Definitely the Guggenheim..the kids will love the Marini's.
Seriously....is this late planning? Hit the basics and wander....and with two kids along, ride the Vapperetos everywhere.
As Nigel said, you really should consult a guidebook. Here is an itinerary idea from this website’s host Rick Steves Venice Itinerary.
Venice restaurant have been covered endlessly on this site. You could use the search bar above and type in “Venice restaurants” or “Venice dining”.
We spent a day  taking the   boat  to the Cemetery Island (sorry I forgot the name)  very  beautiful and  interesting -  beautifully maintained and  several  very famous people buried there.....
then on to  Murano -  walked around  saw the  glass blowing and  enjoyed a nice lunch,  then  back on a  boat to Burano  (my favorite)  famous for lace making and  the colorfully painted houses.
Then  took  the boat  back  to  Venice.
When I say   boat - it is more of a transportation service  -  nice roomy ferry type boat.
Theres a good section on kids in Venice in the travel guide Venice in a Day