HK to Shenzhen - VOA, "Address in Shenzhen" Query

I plan to visit Shenzhen for the day from Hong Kong and will be applying for a 5 day visa at Lo Wu. I notice that on the Shenzhen Visa Application Form you must provide an address where you will be staying in Shenzhen - as I only intend on staying in mainland China for a few hours (and will be returning to HK on the same day), I do not have any booked accommodation. My question is what do you write as your address if you are only visiting for one day?

Many thanks.