I did both in one day and it was very tiring (and I'm in my 20s). Herculaneum is small enough that anyone without mobility issues can do it, but Pompeii is quite large.
I also went to the volcano and the hike is about 3/4 of a mile and moderately steep. If your children are active they should be able to handle it, but the key is to wear shoes with good traction. Also they sell wine at the top, which is nice :)
I also went to the volcano and the hike is about 3/4 of a mile and moderately steep. If your children are active they should be able to handle it, but the key is to wear shoes with good traction. Also they sell wine at the top, which is nice :)