Hi again Steve and Sonya, and thank you so much for supporting our guidebooks!
Several questions so I will try to be concise.
Re Nafplio, Leonidio and Zobolo. Yes, all three can be reached by KTEL bus from Athens. Whether or not your destinations will be connected to each other, though, is hard to say. Routes and timetables change, so it is best to check closer to your visit. Also, there may not be direct connections between each place, which can mean long layovers at some regional bus station. If you are considering renting a car at some point during your stay, this would be the time to do it.
The KTEL bus station for buses to Peloponnese is here: 37.998627, 23.698942 (map coordinates). From the Athens airport, you can take the X93 bus to get to the KTEL station.
Re Zobolo / Neapoli: The cliff stands alone in an area near Neapoli. Too far to walk from Neapoli, but a short drive (less than 25 min). Yes, you can rent a scooter in Neapoli.
Re Neapoli to Crete: Not possible, to my knowledge. The best way to get to Crete is from Athens.
Re Santorini to Kalymnos: There is no direct connection, but I am sure there is a connection to Kos. From Kos Town, take the catamaran to Kalymnos or go to Mastichari port and take the local ferry.
So to recap, the most sensible itinerary (in my opinion) is this: Don’t try to connect the Peloponnese and the Crete legs of your trip. Treat them as two separate trips originating in Athens. If your budget allows, do this: rent a car in Athens and drive to Nafplio, Leonidio, Kyparissi (see below), Zobolo, and back to Athens. Then, take a ferry or plane to Crete and from there to Santorini–Kos–Kalymnos. If you do this, it’s actually quite simple )
*Note: Make sure to visit Kyparissi while you’re at it. It’s one hour south of Leonidio. A beautiful new climbing destination; we just had a small festival there this weekend, and I can guarantee you it is one of the prettiest places in Greece, with amazing rock. See here: http://climbgreece.com/kyparissi-bolting-project-new-crags-many-easier-routes-and-a-climbing-festival-in-october/
I hope this helps.
Katie (on behalf of Aris )