Shenzhen might be worth a look, next door to Hong Kong with nice beaches and golf courses. Shekou area is popular with westerners.
Shenzhen Airlines operate from ZGSZ as do Jade Cargo (check if they're still operating).
Haikou/Sanya on Hainan island are less polluted but more isolated
Coastal is better than inland. An industrial city in the middle of the country with pollution and few English speakers is best left for the more adventurous.