Ni hao, Severine! Xie xie ni de wen ti.
First of all, welcome to China! March/April is a nice season for trip, especially for Southern China, like Hongkong, shanghai and Hangzhou. It’s the Spring in these cities, while it’s still a little bit cool in northern of China. But I’ll still recommend you to go to the north.
Since you have 2 weeks for travelling, it’s quite enough to organize a relax trip. I suggest apart from those 3 cities, you can consider Beijing, Huangshan mountain and Yunnan.
Beijing is the capital, I don’t think you will miss it when you come to China, besides, it’s about history. You’ll see a lot difference from Shanghai and Hongkong, though they’re all modern cities. But if you’ve been Beijing before, you can go to Xi’an instead, to take a look at terra-cotta warriors. Huangshan mountain is said the most beautiful mountain in China, you’ll not regret to visit there. And Yunnan, very beautiful and full of different culture as many miniorities live there.
Well, before you come to China, you may let us know your schedule, so we can give you some suggestion for a best route.
Xia ci liao! (talk to you later)