Algarve is the county which include all the south of Portugal.
It is like the "côte d'azur" in France.
The sun is shinning most of the year and consequently the zone is invade by tourists.
Many bus and trains from Lisbon go to Algarve. Once there," Rodoviaria Nacional" offer a good network around all the zone even small harbours on the inside. The train goes to every main cities as Lagos, Portimao, Silves, Albufeira, Faro or Tavira...