Would you do Tivoli as a day trip with the Villa d'Este and what else in that day, or make two trips from Rome? Would you take the train or bus in the rain?
There's not enough information in your question to answer it. Here are two good posting from Ron in Rome that might answer what you're wanting to know: Tivoli and Villa d-Este and How to get to Villa Adriana
Sorry I was incomplete. I have read Ron's article. Would you do the town of Tivoli, Villa d'Este and Hadrian's in one day or make two trips if you had time. Would you ride the bus all the way or rent a car if you were doing all three in a day? Finally, if you were doing the Tivoli area, is there anything else that you consider a must see? mahalo!