what is the best,and fastest way to travel to Shenzhen coming from Hongkong and any means that can bring us back to Hongkong?

Dear Ms Philippines,
Also myself I will go in Shenzhen on June.
I know that there are 3 different way to reach Shenzhen from Hong Kong: by ferry, by bus and by train.
Therer are several scheduled trips for any of those transportatio.
As regards where to buy, also me I would like to purchase something, but unfortunately I do not know any places.

Hi - I was shopping in Schenzhen on Monday this week, 18th May and it's great if you know where to go. I was recommended the following by a friend who lives in HK and shops there regularly. For DVD's and electronics go to Jack in shop 21 Level 5. FYI he only had i-phone copies. Then ask him to get someone to take you to Betty for bags, watches etc (she owns both shops). Once you are at her shop say straight away that you want to see the good stuff, not what's in the shop and she will take you round the corner to her lock-up, which has much better quality. You will pay a bit more, but it's worth it.
The easiest way to get there is to catch the train to Lowu and you can get a visa at the border once off the train. There is an ATM as you come out of customs to get local currency and only pay in cash. There is also an ATM on Level 1 of the shopping centre. Have fun!

Ms Phillppines;

I am planning to be in Shenzen on 15th July with my friends.Pls send me details of pkg tour for Shenzen.kindly reply on my email id gmail.com|dgs

Thanks
Dilip Shah
India