Is there a van for rent in Sanya?

I plan to go to SY on 24/7/13 with my cousin. There are 11-13 person in my group. I want to rent a van for travel in SY by ourself. Where can I get it? Is there a rental van agency at the SY railway station? How much does it cost per day? What's time that they start and finish work? I want to go to Nanshan cultural tourism zone, Luhuitou and End of the earth, is it possible in one day? after finish trip we have to catch the bullet train back to wenchang.