Several buses a day run from outside the railway station in Castelvetrano to Selinunte. However the timetables are 'not entirely reliable' so be prepared for a long wait.
Adult price: 9 EUR (October 2010), which also permit entry into the remains at Segesta in the following 2 days.
As all archeological parks it is a pedestrian area but there is an electric bus running up and down the park taking you from the Temples area to the Acropolis through the harbour.
The Selnius complex is large and impressive, with excellent views over the coastline beyond.
Near the entrance are three temples: one imposingly re-erected, one partially rebuilt and one a huge pile of stone columns and lintels.
Further on is the Acropolis - the former city has some monumental protetcive walls, especially impressive is the North Gate. Inside are another four temples, again in varying states of repair.
Enjoy the quiet beaches.
There are a couple of good local bars in the village in front of the small harbour serving snacks year-round. A good place to relax.
There are restaurants open during the high season, and probably the evening.
Check with the local tourist office that the hotels are open in Winter.