Going to the Acropolis, which we did on our own, was an adventure in that I was determined to make it up there. I read online about handicap accessibility and I was able to make the scary elevator ride up and down. It was well worth the experience of being in one of the oldest places on earth.
We got a taxi directly from the terminal, you need to negotiate the price because they want you to take them for the whole day. We just wanted to go to the Acropolis it cost us 20 euros.
We then took a taxi to the PLaka for lunch and shopping very nice place to do both.