your second question is warned or not..
Answer:If there isn't a warning don't be so confused (actually I don't understand this question)!

your third question is how do you change your money..
Answer:Go to the changer.All the country have 1 or 2 changer bank..

Beijing – go to Temple of Heaven, Pearl Market acrss the street from there, Great Wall, try to go to Si Ma Tai, remote area of the wall very little commercialism and in ruins, very nice
Shenzhen – http://www.travelchinaguide.com/cityguides/guangdong/shenzhen/
HK and Macau – http://gohongkong.about.com/

Hong Kong is great. Very busy and modern. I've only been once.

October is the best time to go to Beijing. You'll definitely want to see the wall. I prefer Mu Tan Yu to Ba Da Ling. These are the two nearest sites to visit the Wall, the latter being the more popular. Both have luges you can take to get down from the Wall – sooo much fun!

You'll visit the Forbidden City. Get a tour guide. They can tell you all the little interesting facts. Shopping in Beijing is GREAT! If you are there on the weekend, visit Panjaiyuan. It's called the Dirt Market in English and it's sort of like a flea market. It has all sorts of things. It was redone a few years back and now it's very upscale compared to what it used to be, but it's still a wild cultural experience that is lots of fun even if you are not buying. Go early in the morning before the crowds get too big. Go to Hong Chou, the Pearl Market. It has everything Silk Street has but they seem to bargain better than they do at Silk Street. I haven't been to Silk Street since they moved it into that building. Be prepared to bargain! DON'T pay the first price they ask. You should be able to get it for much, much less than they ask. Walk away if they aren't willing to come down, they'll call after you.

#2: if you happen to know a friend, you can ask for help: invite all the " friends" you want to know to a dinner. Dinner is the most popular networking event in China.

#3: search for any conference/forum/submit held on Guangzhou during your stay and register for it. Even you are not interested in the event topics, you want to meet people.

From culture perspective: show them how you can help them with the relationships, especially for local business people who don't have global travel experience. They want to know why they want to spend time with you, a stranger without a “guan xi" in China.

There are a couple of nice gardens and 2 temples that are ok.

The main one is the better of the two with spooky skulls on top of spears.

The main reason why you should go is to visit the the grasslands in the area summer time then the flowers are in bloom is meant to be the best time. Most hotels you come across will offer tours to the grasslands there you can live overnight in a yuk. Some of the other tours will offer you a visit to one of the desserts in Inner Mongolia.

Drink plenty of water on the trip, and I like to bring snacks. My stomach always feels a little odd when I'm at 30,000 ft. Not bad, just odd, almost like I'm hungry, and somehow a snack makes it feel better. I prefer the aisle seat so I can get up and walk around.

China is very interesting. It depends on which part you will go to, but I'm sure you'll be shown a good time. However, you'll need to go with adventure in mind. Not just because it's China, but whenever you go on one of these kinds of trips you need to be ready to be amazed, or often you'll go home disappointed. The most fun you will have is being with a group of people out of your element and out of the eye of your parents and other authority figures in your life, but don't forget to take in your surroundings and soak up the experience. And don't give your band leader too much trouble. I'm a teacher, and I know what a massive responsibility it is to take a bunch of teenagers on a trip. It can be total hell for the teacher, and remember, he is making a major sacrifice for your benefit.

As for China, as I said, it depends on what parts you are going to what you will see. Regardless, leave room in your luggage and bring a little cash to buy souvenirs. There are tons of cheap stuff for sale here, but don't be afraid to bargain for the price. You are expected to do that here. I usually pay between 10 and 50% of what they are asking, depending on if I'm in a high tourist area or not, but you should just pay what you think it is worth to you, as long as it's less than what they start at. Don't worry, you won't offend them. In fact, if you pay the first price, they aren't satisfied because they worry that they could have gotten more from you. Bargaining is fun!

Try some street food, just be careful what you choose. I've never gotten sick from the stuff, but you never know. Take lots of pictures. Carry toilet paper with you and be prepared to squat. Actually, you'd prefer to use a public squatter than a regular toilet. They may stink and you'll sometimes see some distusting stuff, but at least your body isn't touching anything. Drink bottled water. In Chinese restuarants, if you ask for water, it will be hot water in a glass glass, but they usually also serve Coke, Sprite, or orange soda with the meal. The hot water is safe to drink, but I don't enjoy it.

People will call out "hello" to you from 300 yards away, and then giggle madly. They will stare. If you are blond, they will want to take their pictures with you. Just go with it. Wave back, make faces, and have your picture taken.

Read up on the places you will go. I've never had a good guide in China. They put me to sleep and frustrate me with their insistence on sticking to the script. They don't tell any human interest stories about the places you visit.

I can't think of more than that. I hope you get the chance to visit the Great Wall. If you do, I'm sure you will go to Ba Da Ling, though I prefer Mu Tan Yu. Either way, if you have the chance, ride the luge down. SOOOOOOO much fun. Also, be prepared to be hassled at the major tourist sites. The people there want to sell postcards, guidebooks, and all sorts of stuff, and they can be agressive. Just tell them very firmly, NO!

One last thing. China is very safe! But pickpockets are becoming more prevalent, so be careful.

I just read some of the other posts. You'll definitely want to bring your own medicines. Unless it's narcotic, you don't have to worry. I always stock up on several huge bottles of tylenol, etc., when I go home because I can't read the labels here, and it's not the same stuff anyway. Also, if you are bringing any electronics, like battery chargers for your camera, etc., you'll need a converter. Most camera equipment comes with its own converter, but check. Other than that, you should be able to buy everything here.

Try to avoid travel agency,just buy air tickets and book hotels on your own. Remember the important sightseeings, go to destinations by subway or taxi.

Most educated young people can speak some English.You should speak english slowly and simply.