According to Baidu map, Haikou is about 285.6 kilometers away from Sanya, and the journey takes about 3 hours and 38 minutes, passing through Hainan Island Expressway. So, it's far.
Haikou's delicious food includes Haikou milk tea, Hainan powder, porridge noodles, Qingbuliang, Joan's sugar water, coconut rice and Haikou roast suckling pig.