1. Stop sign =/= California stop sign
3 seconds are not necessary

2. No turn on red
It’s implicit. No turn on red within the city’s boundary

3. One of the biggest community is Chinese community
Speak mandarin! English doesn’t work well here. Bring cash!

4. Sales tax can be avoided by paying cash
Many restaurant gives a “cash discount” to people who pay in cash
For the restaurants, they won’t report this transaction to the IRS.

5. Tips is 17% in manhattan and it should be BEFORE tax!

Those are what my New York friend told me! =p No offense