We are traveling from Spetses to Monemvasia in July. Are there any options (ferry, taxi, private charter) to go by sea? There are 15 people is our group.
There is no "formal and organized" service from Spetses to Monemvasia, unfortunately. There really should be. When you are there, however, you can ask and you will probably find someone with a "kaiki" to take you. 15 people is a good size group and you should have no trouble doing it.