Eastern Province (Saudi Arabia)
The three main cities of the Eastern Province are all tightly clustered together and no more than a 15-min drive apart from each other.
The rest are scattered around the coast:
Public transport is very limited, so having your own wheels will really pay off here.
Best to ask your hotel or colleagues and have a regular taxi where you know and can trust driver.
You can find all kinds of cuisine here. You find a lot of Indian and pakistani restaurants. Finding standalone Vegetarian restaurants is just too impossible.
Carry your passport/work permit all the time. You can asked to produce your documents any time of the days and night. Do not point your camera at a lady. Do not carry alcohol/drugs into Saudi Arabia. Avoid carrying medicines unless you have a prescription along with it. Do not carry any pornographic material with you.