A bus from Athens costs a little over €5. The buses drive from a terminal near the southeast corner of the Areos Park a few blocks east of Victoria Metro station (there are more bus terminals in the area - for more information ask in the KTEL kiosk). Buses arrive every hour, but they make a few other stops in Athens. The bus terminal in Sounio is just below the temple. The last bus back to Athens starts at 9 PM in Sounio, late enough for the famous sunset over the temple. A one-way drive takes approx. two hours.
The sunset over the temple is very famous and absolutely gorgeous. The temple area closes just after the sunset.
There is a taverna just below the temple, next to the bus stop. It is rather expensive and not very impressive.
- Grecotel Cape Sounio. On Cape Sounion near the Temple of Poseidon. It is generally far (~69 km) from the centre of Athens but the location is excellent. Bangalows with private pools.