Sumatra in detail
Places of worship Be respectful. Remove shoes and dress modestly when visiting mosques; wear a sash and sarong at Bali temples.
Body language Use both hands when handing somebody something. Don't display affection in public or talk with your hands on your hips.
Clothing Avoid showing a lot of skin, although many local men wear shorts. Don't go topless if you're a woman (even in Bali).
Photography Before taking photos of someone, ask – or mime – for approval.