travel around Hainan for Spring Festival 2013

I am traveling alone from Qingdao to HN around 2/1 and I plan on celebrating Spring Festival in Sanya. However, I am a bit lost when it comes to travel and accommodations in this area. I would like to find a clean comfortable hotel in Haikou and then go explore the city until the rest of my group arrives. Any suggestions on where to stay (somewhere affordable) transportation to the sites and other useful tips about the island. What is the average temperature?