you can say the following things in Chinese like : As a surprise for her (I would like to/will) 为了给她一个惊喜，（我要......） Oh you surprised me!噢，你真是太令我惊讶了！ I want to surprise them我想给他们一个惊喜 I was surprised to hear/see我惊奇地听到/看到 It's not surprising这没什么可惊讶的 Wow what a surprise!喔，这可真是个惊喜！ It took them all by surprise这使他们非常惊讶（I'm not sure about this one） "surprise"only show the meaning of 惊，but it difficult situation, we use different wods in chinese. While, we can use different sentences to express a same meaning,such as 吃惊=感到惊讶

Surprise means 驚 in a single chinese word, but it is more appropriate with two words grouping together like 驚喜, 驚異, 吃驚, 驚訝, 驚奇 etc., It can be a noun, adjective, or adverb, it depends on how you group them together and where you place them. As a surprise for her -至於她一個驚喜 Oh you surprised me! - 噢，你讓我吃驚！ I want to surprise them - 我希望讓他們感到意外 I was surprised to hear/see - 我驚奇地聽到/看到 It's not surprising - 這並不令人驚訝 It took them all by surprise - 使他們所有的驚喜 When you look up " surprise" it will display all the possible combinations, you need to choose one that is more appropriate for your application.

As a surprise for her (I would like to/will) 我想要。。。给她一个惊喜 Oh you surprised me! 喔，你给了我一个惊喜！ I want to surprise them 我想给他们一个惊喜。 I was surprised to hear/see 我惊奇的听到/看到 It's not surprising 这不让人吃惊。 Wow what a surprise! 噢，好个惊喜！ It took them all by surprise 让他们都吃了一惊。

It took them all by surprise 这让他们措手不及.

Surprise in Chinese is not as 'various' as it is in English. And in Chinese, 'surprise' is more a noun. So, when you say 'surprise sb', you have to turn it into a noun, like 'give sb a surprise' (给sb一个惊喜).