Shenzhen is located at the north of Hong Kong. It is a mainland China city, which is classified as a special economic zone. It is a modernized city. Some visitors like to have a one day trip to Shenzhen. It is encourge to take Shenzhen Metro to ravel around the city.
Visa is necessary to go to mainland China. However, visa only for
with Shenzhen Metro at both port.
Shenzhen is a big city. The metro cover most of the urban area, you can enjoy shopping, dining and entertainment by metro.
The design of Shenzhen metro is similar to Hong Kong MTR, so you can enjoy the journey there.
Yuan (RMB) (The currencies in mainland China) is suggest to use in Shenzhen, the rate to Hong Kong Dollar is 1 Hong Kong Dollar to 0.94 Yuan, it is recommanded to exchange Yuan in Hong Kong.
Detail of the Visa: Only for Shenzhen and 7 days. Apply at the Shenzhen custom counter at Lo Wu or Lok Ma Chau. Fee ($150) and photo is necessary for such Visa, also, your valid Passport is also needed. Operation Hour: 9am - 9pm. Hope you can enjoy a trip to Shenzhen.
(The information of visa are reference fro Yahoo! Knowledge, original version is in Chinese, http://hk.knowledge.yahoo.com/question/?qid=7007110802205)
Shenzhen Travel Guide - http://220.127.116.11:10000/index.aspx?aspxerrorpath=/VisitShenzhen/index.aspx
Shenzhen Metro (Chinese) - http://www.szmc.net/index.jsp