yes, you can travel to Shenzhen on May 29 2010 and stay for 3 days because your passport has at least 6 months remaining validity. Do you want to apply for China visa on arrival in Shenzhen or obtain a China visa before arriving in Shenzhen, it is possible for you apply for a visa on arrival valid for 5 days only in Shenzhen, you can't use the visa to go to other places within Mainland China.