There is no need to convert your money to American currency. Holders of Visa, MasterCard and other bankcards can also obtain local currency from authorized ATMs at convenient locations throughout Hong Kong. Please check with you bank before your departure. Yes, English remains as an official language in Hong Kong. Most people, especially those in the service industry, speak English.
All major signage is in English or is bilingual.
Small tips may also be given to taxi drivers, bellboys, doormen and washroom attendants. The sockets are for three-pronged flat plugs. Most hotels provide transformers and plug adapters.