We are four adults planning a trip to Rome in early May. We have booked a 3 hour private tour of the Colliseum/Forum/Palentine Hill to get the most out of it. However, we do want to see the underground of the Colliseum as well which I understand is a 90 minute tour signed up for separately. Combining those two is 4.5 hours back to back and would be exhausting. Is is possible to bring a picnic into the Colliseum/Forum area? With the idea to do the 3 hour private tour, rest and haveour picnic lunch somewhere on the grounds, then do the underground tour of the Colliseum (or vice versa). Alternatively, to do one or the other, exit the area and have lunch at a cafe, and return to do the rest. I have heard conflicting information about being able to leave and return in the same day (BTW - we are using the Romapass for the entrance).