The calculated distance (air line) between Happy Valley and Siu Lek Yuen is approximately 8 miles respectively 13 kilometers.
By car or train, the actual journey to Siu Lek Yuen is certainly longer, as only the direct route (as the crow flies) between Happy Valley and Siu Lek Yuen has been calculated here.
Air line (approximately)
13 kilometers
7 nautical miles