Hello,
We are going to get Roma pass and use it to enter the Colosseum. As suggested, I will call to book an underground tour for myself and my son. We want to do Palatine Hill and Roman Forum on the first day, as we are reaching Rome in the afternoon and do Colosseum and underground tour first thing in the morning on the following day. I was reading the responses and it seems that I need to do Colosseum first before I go to Forum if I have booked underground tour. Is this correct? Do you know if I can add an underground tour for the following day when I pick up my tickets at the Forum in the afternoon? Thanks for your help. My son is eager to do this in the morning and not after a transatlantic flight.