This is the 4934th most frequent Polish word.
plaża
Beach.
Here, 'plażę' is in the accusative case because it's the object of the verb 'chodzić na'.
Uwielbiam chodzić na plażę podczas letnich wakacji.
I love going to the beach during summer holidays.
Here, 'plażę' is in the accusative case as it's part of the complement in the sentence describing the view.
Widok z okna mojego pokoju obejmuje piękną plażę.
The view from my room's window includes a beautiful beach.
Here, 'plaży' is in the locative case as it specifies the location where the action takes place.