We had an awesome tour guide, named Simone Testa. He knew everything and everyone. He thought out all possible problems in advance and took care of every detail. Greece had a worker's strike when we were there, but we had a bus driver and went to other destinations. It was an incredible value and we could never had seen what we did without a guide!
We saw two islands and visited a winery, ancient ruins, a pompai like museum, several local restaurants and great accommodations. We think we have found a way to travel that suits us. We met wonderful travel companions and got along with everyone.
Greece is a little bit hard to traverse, so if you haven't walked 5 miles a day, you should prepare yourself by getting in shape! It is worth the effort.