if you are the first time in Hong Kong I can recommend a city mobile guide. It is based on a rental Smartphone and it comes with a preinstalled software. You have combination of a travel guide, a navigationsystem, internet access and a phone. So first of all it gives you recommendations in sightseeing, food and shopping, presented by a Chinese Lady in videos. Then you can press the “take me there” -button to find the best way to get there (MTR station and calculated taxi fee is shown) On the interactive maps you always see where you are. Beside this local calls and internet are free and one hour daily IDD calls are also free of charge. I don´t like to type long texts on a touchscreen so I was glad that I could use this phone as internet access by connecting it to my laptop. I liked this all-in-one solution, which was more than just an App for me. This guide was called “Ask Ting Ting” and I booked it on their webpage, then they brought it to my hotel. So I think it is a good solution if you want to stay flexible and discover Hong Kong individually.