I will be going to Shenzhen next week (27/03 - 31/03).

According to the weather report, it is getting warm then, and can be a little cool at late night. The temperature shall range from 15C to 22C. It will be cloudy on Mar. 27-28, and rainy on the rest days. I suggest you prepare long-sleeved shirt, jacket, jeans, long john (if you are afraid of coldness) as well as rain gear.

For transportation, you can go to Luohu Railway Station to take a bullet train to Guangzhou Station. Transfer to subway line 2 to Gongyuanqian. Get out from exit A and walk for around 750yd to find the mosque on Guangta Road. Do ask the local about the correct directions.

But what products do you wanna buy? Anyway, the best shopping places for tourists are Beijing Road, and Shangxia Jiulu. For visit, you can view the Pearl River and Canton Tower.

Well, it is fine to buy tickets on the spot or book in advance, but I'm afraid you cannot avoid the queue by all means.