it will be very tempting to go to Capri for a day trip but i'd reconsider
very pricey to get there and stupidly busy. having said that i was pushed for time, but the queues for anything are long and everywhere is crowded. if it's between that and something else i'd consider the other thing data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
if you do one thing in Roma make it the Colosseum. there will be massive queues but is worth it. you can really feel the history in that place