US citizens require a Social Visit Pass, which is issued on arrival, provided the traveler holds a valid passport, sufficient funds to cover stay in Singapore, confirmed onward or return ticket. A social visit pass will allow you to stay of 14 days, but you are able to apply for extensions of upto 90 days. *Visa and entry requirements are subject to change at any time. Please always check the current status with your applicable embassy prior to travel.
Singapore doesn't offer working holiday visas.