给 + Someone + 一个 + 惊喜 / 感到 + 惊喜
惊喜 (jīngxǐ) means "pleasant surprise" and can function as both a noun and an adjective. It describes the feeling of being happily surprised or the event that causes such a reaction.
生日那天收到朋友们的礼物,真是一个大惊喜。
Shēngrì nà tiān shōudào péngyoumen de lǐwù, zhēnshi yí gè dà jīngxǐ.
Receiving gifts from friends on my birthday was truly a big surprise.
他突然出现在我面前,给了我一个惊喜。
Tā tūrán chūxiàn zài wǒ miànqián, gěi le wǒ yí gè jīngxǐ.
He suddenly appeared in front of me and gave me a surprise.
老师为孩子们准备了一份特别的惊喜。
Lǎoshī wèi háizimen zhǔnbèi le yí fèn tèbié de jīngxǐ.
The teacher prepared a special surprise for the children.