The most touristy thing we do when we head to Hong Kong is visit Hui Lau Shan for their sugary mango fruit juice with jelly. (They have an outlet at the airport too!) They are so addictive and such fun to drink, we always end up having an overdose of sugar rush in our brains. At HK$26 a drink ($4.30), we are always finding excuses to have more desserts. We found a couple of them in Kowloon district and also one in Causeway Bay on the main road opposite SOGO.
Our favourite is K3- Mango, Strawberry with jelly drink. The green one above was Mango and Aloe vera jelly which tasted just like the normal jelly.