My hope was that Paestum would be an easy side-trip since we have to
make it back to a major rail hub regardless. Salerno v Sorrento...
from Amalfi I can't see that it makes a lot of difference. My hope is
that the high speed rail lines will be pretty reliable if I can be
close to one on Friday.
It is an easy side trip FROM Salerno. Not from Sorrento. There is a huge difference in time and transportation options. From Salerno it is a 30 min train ride.
From Sorrento to Amalfi it is almost 2 hours on the bus. Then a transfer to Salerno 1hr 15 min. then train to Paestum.
OR Amalfi to Paestum and then back to Rome.
As I posted above there is a lull in trains from Salerno to Paestum.
There is a 9:35 train, next is 12:22. You will want to be on the 9:35 train to get the most out of your day. Suppose it could be done from Amalfi but it’s risky. (8:00 bus Amalfi to Salerno- arrives 9:15 IF bus is on time. You have 20 min to get to train station (I think bus is behind the train station-10 min walk) get train tix unless purchased in advance and to find your train.
https://www.positano.com/en/bus-schedule?route=amalfi_maiori_salerno#section-schedule-result
Check train schedules very carefully. Do not rely on Google maps or rome2rio or anywhere else to plan this adventure. Go to the actual train site.
https://www.trenitalia.com/en.html
The guidebook seems to say that I need to get a bus from the Paestum
Archeological park to the Paestum rails station by bus, but after that
the regional or Frecciarossa train can be in Rome in about 2.5-3.5
hrs.
I’m not sure what he’s talking about here. The station that is near the Archeological site is 11 min walk according to Google- we walk slow so it took us maybe 15. It takes you right smack to the middle of the temple grounds. If you look at Google maps you can see the station and the walk along SP168- thru some fields basically.
https://www.google.com/maps/dir/Paestum,+SP168,+Paestum,+SA,+Italy/Paestum+Museo+Archeologico,+Paestum,+SA,+Italy/@40.4223918,15.0084005,17z/data=!3m1!4b1!4m14!4m13!1m5!1m1!1s0x133bfd73fccf98ad:0x6e18a54d987f3b3e!2m2!1d15.0147232!2d40.4216979!1m5!1m1!1s0x133bfd5068302e99:0x8b88ef683f84d69a!2m2!1d15.0069595!2d40.4232275!3e3
From that station you can take a train to Salerno or Naples to catch your fast train to Rome. (There are more fast train options from Napoli Centrale)
Sorrento is NOT on a fast train line. Requires that extra step on Circumvesuviana.
JMO- but I try to keep all transits as simple possible. Choose the most direct/easiest transit routes. The fewer transfers/changes the less likely you are to miss one or encounter delays, etc. Allow plenty of time to make those transfers as well.
Getting to and around the Amalfi Coast is not a simple thing not even when you have several nights to work with.
He is a big mythology fan which is why, when I realized Paestum was so
close and so nice, I thought about adding it in. We almost did an
Athens trip instead of Rome, but this one lined up better.
^^This right here would be my #1 reason for going to Paestum and dropping all thoughts of Positano, Path of Gods etc.
Your days in Rome are quite full. Vatican visit and Colosseum visits can be exhausting and both take a good half day or more.
On Wednesday I would absolutely skip the papal audience and leave the day free. Maybe sleep in then go up to Borghese park and have some fun renting bikes.