去 + 海边 / 在 + 海边
海边 (hǎibiān) is a noun meaning "seaside," "beach," or "coast," formed from 海 (sea) and 边 (side/edge). It refers to the area near or alongside the ocean. It is commonly used with the verb 去 (to go) to express going to the beach and frequently appears in contexts about travel and leisure.
我们暑假去海边玩了三天。
Wǒmen shǔjià qù hǎibiān wán le sān tiān.
We went to the beach for three days during summer vacation.
海边的风景真美。
Hǎibiān de fēngjǐng zhēn měi.
The scenery at the beach is really beautiful.
他每天早上都去海边跑步。
Tā měi tiān zǎoshang dōu qù hǎibiān pǎobù.
He goes jogging by the sea every morning.