"Wait to be seated": Do not jump at the first free table but wait until the waiter or waitress comes to show you to one of the tables.
Food and beverages: A "refill" of non-alcoholic beverages is usually free (except if they are served in cans). Drinking alcohol or smoking at public places are frowned upon, at many places it is even restricted. The obvious carrying of alcoholic beverages is illegal. Alcoholic beverages are not allowed for people under the age of 21.
Bill: The bill arrives at your desk without asking for it. A long stay in a restaurant is rather uncommon. The one who invites is also the one who pays the bill. In case the person who invited you is not the „host“ you will take care of the payment.
Tip: Please give generous tips since the restaurant staff only has a very low basic salary and therefore relies on tips. At restaurants in towns with a high number of tourists the service is included; this is often mentioned on the bill, sometimes hand-written, as "15 % service included". If not stated, give an appropriate amount yourself. Even though the tip is a voluntary gesture it is actually the waiter’s or waitress’s wage. Be generous! As a rough guide: double the tax.
Time management: A delay in the USA is seen not as bad for example. But as soon as you sit down at the table to start the business talk the rule applies “time is money”. Negotiations to be very quickly and contracting at the first meeting is not an exception.