Sunset Crater Volcano National Monument erupted sometime between 1040 and 1100. Families can find lava flows and cinders still look as fresh and rugged as the day they formed. Walk the one mile Lava Flow Trail and see the lava flows and cinders at the base of the crater.
The hiking trails to the actual crater have been closed, so the actual involvement you can achieve at this monument is pretty limited.
There are some interesting facts about the volcano errupting that older kids might be interested and there are some old lava flows you can stand in and feel.
I would only return if they opened up the hiking trails so you can actually see inside the crater.