"There’s some crazy slabs here, a world-class rivermouth which has done the rounds lately, and obviously the fun longboard wave at Riyue Bay,” Co-Founder of Surf China Co. Ethan Huang told SURFER. “But when there’s a solid swell, there's no one surfing the heavy waves. We aren’t worried about overcrowding. We want surfers to come to Hainan.”  That may soon be a case of careful what you wish for. With the South China Sea’s waves, a new park powered by PerfectSwell technology, and elite golf courses, the Chinese island has become a unique surf tourism prospect. Add the island’s palm-fringed white sandy beaches, year-round warm water, 2000-year culture, incredible food and modern, clean and affordable infrastructure, and duty-free status, and maybe this joint won’t be uncrowded for long.  Surfers aren’t a new species around here. In the 1980s, SURFER sent photographer Warren Bolster and journalist Matt George on the island’s first surf mag trip.…