Day trips to Shen Zhen. China

Hi all, i'm thinking of visiting Shen Zhen for shopping on day trips from Hong Kong where we have hotel accommodation. I'll be applying for 2 entry visa but on the the application they ask for where i will be staying and from previous applications proof of where i will be staying. What do i put down, as I'll be returning back to HK in the evening? Thanks in advance. Your help is much appreciated.