Having been told that I should definitely visit Macau given its proximity to Hong Kong, I booked accommodation for a day in Macau and a ferry ticket. The ferry takes approximately one hour from Kowloon so you can get there in pretty much no time. According to wikipedia, Macau was given back definitively to the Chinese as a S.A.R in 1999 after agreeing on it a few years before. Located around 60 km from Hong Kong, it lies on the western side of the Pearl River Delta, bordering with the Guangdong province in China.