Oh and I’m pretty sure that there were no feasible train or bus options- car is a must AND you need it to get to the world class ancient sites in that region which are a MUST. When booking car hire in Greece, go with a reputable international dealer (Thrifty, Hertz) as they have a reputation for ripping you off if you go for a smaller company (indeed this happened to us in Rhodes with Global). I’m sorry to say that there are a small proportion of folk who think it is ok to rip tourists off in Greece, although the vast majority of people in Greece are completely lovely.

During summer season you can find ferries from Nafplio mostly to the Saronic islands (Spetses, Hydra, Poros, Aigina). For more information you may contact the administation portuaire in Nafplio (nafplio.gr/limanialimenarxeiomenu.html)

If you are going to be driving in Greece, make sure you bring with you International Driver's Permit. I do not know where to procure this in Australia. In the U.S.A., we got ours through AAA. Napflio and surrounding areas can be done in 2 full days. We rented a car at Athens Airport and drove to Napflio for about two hours. Road and traffic is good from the Airport to Napflio. Having a car is the only way you can enjoy and have flexibility to visit and see Tiryns, Ancient Nemea, Mycene, Epidauros, Palamidi Castle, etc. On your way to Nafplio from the Airport, stop by and see Corinth Canal. From the "freeway/highway" (like and autobahn), take the Isthmus exit for a quick look. You can park and walk to the middle of the bridge and take pictures. If you leave the Airport early, you may even get to stop by Ancient Corinth since this is on your way to Napflio. When in Nafplio, never miss a boat ride to Bourtzi. It's about 15 minute ride for about 5 euros each person. The boat will wait for you for about 20 minutes to stroll within Bourtzi and take take pictures. Make sure to take picture of the Palamidi Caslte about few minutes when the boat departs from the Promenade. It's a picturesque view. We stayed at the Agamemnon. It's right on the Promenade in front close proximity to the sea wall. It's nice to stroll at the Promenade early morning and at sunset.