What is the etiquette for travel in Singapore?

When travelling in Singapore, the following etiquette is recommended for tourists: 

• Remove shoes when entering homes, temples, and mosques 
• Dress modestly when visiting religious sites, covering shoulders and knees 
• Avoid public displays of affection, which may be considered inappropriate 
• Follow cleanliness rules - littering and failing to flush public toilets can result in fines 
• When using escalators, stand on the left, walk on the right 
• At hawker centres, "chope" (reserve) your table by placing tissue packets before getting food 
• Always queue for services as queue jumping is considered very rude