What should I not miss please? I'm doing the colosseum audio tour on the day I get there (Friday afternoon) and on the Saturday I'm doing the vatican / Sistine Chapel, but no other paid for big attractions as I'm only there until Sunday afternoon so I want to have enough time to just soak it up, walk around Trastevere and eat pasta and gelato. I'll use the tube if necessary but I'm a big walker.
Anything else I should be doing? I'm on a bit of a budget too but not enormously so. Just don't want to be extravagant.
Thanks