Apply SingapoRewards
SingapoRewards is an incentive programme offered by the Singapore Tourism Board (STB), to offer travellers a free experience during their trip to Singapore. There are four themes, each with more than 40 different activities that can be browsed: Novelty & Excitement, Dining, Sustainability, and Wellness.
Get a free experience with your family or friends if every traveller satisfies the all 3 requirements:
Reference:
Cards for transportation. Mobile Wallets for sure
It is recommended to use mobile wallets, such as Apple Pay, GPay, Samsung Pay, etc .as your EZ-Link Card for MRT and buses. The EZ-Link card is the most commonly used travel card by residents and returning visitors. However, it has non-refundable deposit of S$5. Mobile wallets, on the other hand, can be used without registration. Train and bus fares will be charged automatically to your bank account or credit / debit card bill. If you have foreign bank cards, you will incur an administrative fee of $0.60 per day of use and your bank's currency exchange and / or administrative fee. For short trips to Singapore, it is recommended to use mobile wallets.
Reference: https://trevallog.com/singapore-tourist-pass-ez-link-standard-ticket/
Buy the hand letters from Changi Airport
Changi Airport continues to offer the Goods and Services Tax (GST) or tax-free for retail purchases made in the public areas of Terminals 1 to 4. This allows visitors to the airport to save 8% on GST. Additionally, purchases made at the point of departure are tax-free, so you don't have to pay GST when leaving Singapore.