Will travel soon on cruise with one port in Rome, only 1 day to take in a tour and want no regrets on my choice. If any seasoned tourist can advise on which would be most rewarding I would appreciate it. Choices..Vatican/Sistine Chapel/Museum with drive through of Colosseum and Forum OR Vatican with tour of St. Clement underground and inside tour of Colosseum. Will be traveling with a 13 and 16 year old.