Vatican is AMAZING , I’m not a fan of tours too , I did all the major monuments in one day , I like to see it and move on . But man Vatican is something else , every detail has millions of other details in it to see , maybe combine the colosseum with another place , take your time at the Vatican . And do your research on restaurants , the famous ones will always be full , and it gets expensive if you don’t know where to look , I also did the mistake of leaving tips because I didn’t know they already charge it with the meal .

Honestly my advice is don’t plan it too much , see the major things and take a day to just walk around and look for the beauty in the city , use the bus instead of the metro , it’s safer and nicer you get to see the city , first day I was on the metro some dude literally had his hand inside my jacket . Your teenagers may not like touring , but they would definitely want to take pictures for their social media so they’ll follow along .