Cascais is a town west of Lisbon (train from Lisbon centre to Cascais centre: about 30 minutes) situated like an amphitheatre facing a picturesque bay full of boats of all sorts.
The train from Lisbon will take you along the Tagus with great river and oceanic views most of the time.
Once you arrive go to one of the many restaurants for a cheap chicken menu or a not so cheap fresh fish dish. There are lots of options in between. You decide whatever your credit card allows you to do.
If you are not the restaurant type and just want to get to know the place, rent a bike (BICAS) for free right outside the railroad station.
If you are a beach person, there is a place for you too, either 150 meters from the train station or further away up the coast with some hard pedalling on your BICAS.
That all folks!! Just do it!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.