Do I need a visa to go from Hong Kong to Sanya?

My family and I will be going on a one week vacation to Hong Kong and would like to stop by to Sanya for about 2-3 days. We're thinking of flying from Hong Kong to Sanya. Will we need a visa to go there? Also, do you happen to know how far is Sanya airport to Nanshan Temple? What's the best transportation to get there? Thank you.