. In Summer it is very hot ( about 25 C---30 C ) and the Sun is strong, so sunscream, sunglasses and suncap should be prepaired.
2.In Winter it is cold ( about 0 C......10 C ) and humid, so enough clothes should be prepaired. In Yangshuo big size clothes are available.
3.If you get wet in the rain especially in Spring or Winter, to take a hot water bath and have some hot tea as soo as possible is a good way to avoid having a cold.
4. Drinking enough water to avoid sunstroke. The local people take a kind of Chinese herbal medicine named " 藿香正气水,( huo xiang zheng qi shui )", It is effective, and available in drug stores. The local people take "藿香正气水" if they vomit or diarrhea because of sunstroke or unhygienic food.
5. The local people use a kind of Chinese medicine called "qing liang you, 清凉油" to wipe on the wound if they are bitten by mosquitoes. Qing liang you is available in the drug stores.
6.While renting bikes, don't forget to check the brakes and tyres, and ask for locks.
7. In China, people walk, cycle and drive on the right side along the road or path. It is very important to walk, cycle or drive slowly and carefully.
8. It is common to bargain, except in big supermaket and some shops with the sign of "谢绝还价，( xie jue huan jia )" , which means "no bargain" .
9. If you don't want to buy something , don't offer your price.
10. When someone follows you to persuade you to buy some thing , you can refuse him/her with this sentence: "谢谢， 我不要。( xie xie , wo bu yao )" which means " Thank you, I don't want it/them".
11. Taking good care of your belongs.especially when you are swimming in livers.
12. Telephone Numbers:
110.........report to policemen.
114.........calling for inquiring telephone numbers.
119.........fire alarm
120.........calling docters.
121.........weather forecast.
122.........report transportaton accident.
12315......consumer complaints.

Your itinerary of guilin I would like to make as follows for your reference:
The first day: make a city tour. Morning to the solitary peak, climb the top of the mountain to see the panoramic view of the city, then to the reed flute cave which called the palace of arts. With colorful lights make the cave fantastic.

The second day take bus or by car to longsheng, you will see the charming spectacle of rice terraces. It is the most astounding of china. Also you can enjoy the minority shows here.

The third day, cruise on the li river down to the backpacker’s mecca yangshuo, feast your eyes with the gorgeous scenery of lining with many limestone pinnacles.and a visit to guilin will not complete without a boat excursion.

The forth day, renting bikes to the moon mountain, Water cave to take mud bath and bamboo boat rafting in yulong river, which reputed as li river’s younger sister.