I'm planning to visit Mycenae and Delphi in a few weeks and I'm finding it difficult to locate a guide or tour of these locations that is available. Does anyone having any guide recommendations that might be helpful? I'm happy to see if they might be available while I am in the area. Also, if I end up striking out on finding a guide, does anyone have any recommendations on audio tour guides for these and other sites in Greece? I'm open to paying for one but only if it's good. I love anything with lots of history, architecture, culture, mythology, etc.
I should add that I'll be staying in Nafplio and Delphi for several days and I'll have my own car, so I have no need for someone to drive me around if that's helpful. I'm mainly looking for a two-hour tour of these sites where I can meet someone at the site if that is something that is even available in Greece at these or similar sites.