Traffic jam is bad in some of the cities, esp the bigger one,
like ShangHai.
Dangerous or not depends on city, places like Guangzhou, ShenZhen,
mostly the southern cities, are dangerous, dont wear your gold
chain, keep your wallet safe. Many pick pockets and "snatch n run"
cases.
After the SARS incident, they improved alot on not to spit on the
floor. bcos during SARS outbreak, they really get ppl fined if they
spit in public.
For the cost of hotel stay, in smaller cities, like the one i am
at, a 3star hotel cost you around 400RMB. A 4 star cost you around
600RMB. But in bigger city like shanghai, it's much more expensive.
I have been to a hotel in Nanjing that cost me 700RMB, but it's
about the same standard of those cost me 400 in the city i am
at.
Eating is cheap, damn freaking cheap. Imagine arount 4-5 ppl go
down stair eat "zhu chao" in singapore, will cost about around 40
dollars SGD. For 40 SGD=200 RMB, can order until you cannot finish
all. And the things are much better than "zhu chao", and the place
is indoor restaurant, not kopitiam.
Travelling is cheap if you take Bus/train/MRT.