We decided to visit Villa d'Este and Villa Adriana. We were absolutely blown away by Villa d'Este. The residence and gardens are well preserved and astounding so when we later went to Villa Adriana we were disappointed because it is almost entirely ruins that your audio guide is telling you "if you can only imagine" and you just can't because there's not enough preserved. Anyway, go to Villa d'Este and skip on Villa Adriana (not only is it hard to get to, but it felt like a waste of time).
Could take it easy this afternoon or go out to the catacombs or Tivoli.
14:581, 15:581, 16:58, 7:303, 20:304, 21:304
Ponte Mammolo Metro B, go upstairs and out to the Cotral bus station (follow the bus signs).
You buy the bus tickets opposite the bar by the Metro exit. Reurn fare is 4 euros, bus takes about 1 hour (depending on route and traffic).
There are several buses to choose from, L1, L6 or L7, and frequent departures.
You take metro line B, direction Laurentina, and get off at the Piramide stop (4th stop from Termini etc; http://www.metroroma.it/MetroRoma/HTML/E…
). Then, you embark the bus line 118, direction Appia Antica to Via Appia Antica. Get off at the stop next to San Callisto. Enter the San Callisto gate and and go to the very end of the walkway, arriving at the San Callisto other entrance on a street almost parallel to Appia Antica. Turn right and follow the signs. Admision price is 5 euros to each catacomb site.