Finally received a reply from Rome that made sense. Booked 2 for 24 hours on our available day. Will walk the 1/2 mile to the Castle, look around a bit then watch for the hop on and off in about 1 hour plus. This will work for us great.
We want to go to the zoo. I know it is silly for most of you, as the quality is highly questionable, but it is one of the things we do. If our Euros will feed a couple of animals for a few days and provide children with the opportunity to see something that might impact them for years to come it is worth it. Everything else in Italy seems to be in "ruins". Sorry for the pun, could not resist.
Two other stops are keen for us and then we will see how much time we have left.
Being able to get on at any of the stops with our prepaid vouchers at the castle, really cuts off a lot of time or expense and/or "leg life"