Dress appropriately when visiting religious sites and cultural institutions.
Leave your valuables behind before a night out on the town, or going to the beach.
When crossing the road, especially in large cities, always keep looking to the left and right and walk slowly!
Try at least once the delicious, local street food.
Always ask permission first before taking photographs, especially in minority areas.
Do not speak too much about politics as it might not be appreciated by your hosts.
It's in your best interests not to drink the tap water, especially after flooding! Do not use sentimental gestures or display overt affection in public as this is often considered inappropriate.
Do not offer money directly to minority people - instead donate to a local charity or offer a small gift, such as pens.