Carcavelos is known by its nice beach, much sought by Surfers, Windsurfers and Bodyboarders
Cascais is a beautiful cosy town that grows around a beautiful bay. It was a minor fishing village, until King Luís I (1838 - 1889) chose it as his royal summer retreat. The Portuguese nobility, and latter the high society, constructed villas, mansions and exquisite gardens in Cascais. Today Cascais is an elegant fusion of 19th-century architecture, traditional Portuguese charm and excellent tourist facilities.
For more information about Cascais have a look at the site of the Tourism Office: