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