Wanshan welcomed over 563,000 tourists last year, a 3.2 percent increase over 2017. About 487,000 made overnight stays. Tourism revenue reached 433 million yuan in 2018, a 14 percent year-on-year increase.

The Dong'ao and Wai Lingding islands are rated as national-AAAA scenic areas. The local government is working to upgrade them to AAAAA, the top rating.

Lyu says district authorities are also striving to improve the islands' environment, infrastructure and tourism resources to entice more visitors and prolong their stays.

Guishan has invested 30 million yuan in improving its two villages through such measures as rebuilding local residences and improving infrastructure.

The island has established high-quality bed-and-breakfasts with 190 rooms in total. Visitors can appreciate decor that blends traditional Chinese elements with ocean themes.

Wanshan is also cultivating its wedding industry, promoting outdoor activities and hosting fishing competitions, Lyu says.