i have booked my ticket to hongkong on may 19-22, 2016

1. You are suggested to stay at Nathan Road. There are many nice but not expensive hotels. Victor Hotel is recommended. The price is around 500 HKD per night. It provides clean environment and warm service. And the important thing is that the surrounding transportation is quite convenience. The exact location is 14th Floor, Alhambra Building, No.385, Nathan Road.
2. To be honest, it's not necessary for you to join in a tour in HK. As it is an international metropolis with modern transportations to be easily accessed, and also English is widely used, so it is quite convenient to find the way to your destinations. In addition, you can do the travel on your own to save the expenses.