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.
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. [http://www.siciliasud.it/luoghi-c-182-tabella-luoghi.html virtual tour Selinunte]
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.