1 hour by coach / train from Rome, Do your homework go by train for 12 euros and see all the sights yourself. you have plenty of time. plan your route. We did Vatican city, trevy fountain, statue of David, Pantheon, and tour of colosseum all in one day with time for lunch.
water taxis again for the experience minimum 8 people 10 euros each but get the water bus back 4 euros. An absolutely beautiful city but had going if you have walking difficulties