Sanhua wine, preserved bean curd and chilic sauce are Guilin's three treasures.
And I am gonna introduce Guilin's three free services: free buses, free park and free toilets.
free bus lines
No.51 from Donghuan Parking Lot to Guilin Station
No.52 from Donghuan Parking Lot to Seven-Star Park
No.53 from Gongjiao Company to Beiji Square
No.54 from Guilin Southern Company to Hi-tech Zone(via Chuanshan Park)
No.55 from Pingshan to Cheguansuo
No.56 from Pingshan back to Pingshan (via Nanxi Park)
No.57 from Xifeng Road via Elephant Trunk Hill Park back to Xifeng Road
No.58 from Nanxi Park to Reed Flute Park
This route is very convenient since it passes almost all the major attractions like Elephant Trunk Hill Park, Seven Star Park, Folk Customs Center, Fubo Hill Park, Diecai Hill Park, Yu Hill Park.
Most buses charge CNY 1(without air-con). The one with air-con, No.99 Bus costs CNY2.

Bridge exposition park is also free. It is made up of 19 bridges, patterned after world famous bridges like Zhaozhou Bridge in China, Alexander Bridge over the Seine, etc.

Another good news is all the public toilets ( nearly 900) in Guilin are free.

Travelers entering Hong Kong from Mainland China may find there are differences between the two areas.
To enter Hong Kong, Valid passport is a must but visas are not necessary for some countries. Try to find this out before your departure.
CNY can be uses in Hong Kong also. So if you have some extra CNY with you, you don't have to exchange it back to dollars or what's so ever, then exchange it again to HKD.
Better to carry identification certificate or document with you.
Different from Mainland China, tap water here is drinkable.
Work Hours of Government are from 9a.m to 5mfrom Monday to Friday and 9a.m to 1p.m on Saturday. This is different from 5-day system in Mainland China.
Toilets are free of charge. No smoking in public transportation vehicles and certain public places.
Time zone (GMT+8) and voltage (220V) are the same as in Mainland China.