Hello,
I may be overthinking this part of the trip. I am trying to figure out how to get from Hydra to Nafplio. On the Greece travel FB page, reccomend the tour from Hydra to Tolo, including Spetses. I emailed the tour company, Pegasus, tour is not everyday, may or may not be able to accommodate passengers in Hydra, one way trip.
Other option, daily boat to Ermioni, taxi to Kranidi, bus.
I am assuming that I can figure out the transportation options/cost, few days before when bus/ferry schedules are more firm?