Hau Wong Temple is located at Junction Road, Hong Kong, China
It is definitely worth visiting if you are already going to the Kowloon Walled City Park
There is some nice ceramic frieze work and it is well cared for.
The temple is quite small and can be comfortably visited in 10-15 minutes if you don't have much time, which makes it convenient to see before or after your visit to the nearby Kowloon Walled City Park.
Take the MTR to Lok Fu Station. Leave the station via Exit B and follow the signs pointing to the Hau Wong Temple.