The City of Athens offers a variety of cultural, historical, architectural and culinary attractions as well as opportunities for morning or afternoon escapades to the sea or the surrounding mountains. Information on monuments, museums, historical sites and sightseeing tours, as well as opening hours is available at the following tourism link: Athens page of the Greek National Tourist Organization
Athens public transport system consists of a dense network of bus lines, a sparser network of trams/trolleys limited to the city center and an expanding metro system that connects the northern suburbs with the city center and the southern regions. More details on getting about in Athens can be found here: Travel within Athens by the GNTO
The international airport, El. Venizelos, is connected both via metro and bus to the city center. Look up details here: Athens International Airport “Eleftherios Venizelos”
The weather in Athens in Autumn is generally mild and dry with average temperatures of 20°C/68°F. Weather forecasts for Athens are available here: Athens weather forecast by Meteo