ATMs and moneychangers are widely available. Credit cards are accepted in most shops and restaurants.
Tipping is generally not customary. It's prohibited at Changi Airport.
Restaurants Many add a 10% service charge, so tipping is discouraged. A small tip is still appreciated when staff have gone out of their way. Don't tip at hawker centres and food courts.
Hotels At higher-end establishments tip porters S$2 to S$5 and housekeeping S$2.
Taxis It's courteous to round up or tell the driver to keep the change.