It depends on your nationality. Singapore tourist visas are not required for citizens of United States for a stay up to 90 days.
You can see the specific country requirements here:
http://www.ica.gov.sg/services_centre_overview.aspx?pageid=252&secid=165 almost 8 years ago
It depends on the country that you are from! usually Americans need a visa while traveling to Singapore! In my opinion it is better to contact the entry requirements with your embassy or consulate so that you can be sure what papers you need for Singapore! You can also ask them about the legal length of stay! Good luck and enjoy ! almost 8 years ago