You must have a valid passport and an onward/return ticket for tourist/business visa free stays of up to 90 days. Your passport must be valid for the entire time you are staying in Japan. You cannot work on a 90-day visa free entry.
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The United States passport is considered the 8th most powerful in the world in terms of travel freedom, according to the Henley Passport Index. US passport holders are currently able to travel to around 180 countries and territories without obtaining a visa or with a visa on arrival.
U.S. citizen tourists entering Thailand for fewer than 30 days do not require a visa. We strongly recommend that your passport be valid for at least six months beyond the date of your arrival in Thailand to avoid possible denied entry. Thai immigration officials or airline staff may ask for your onward/return ticket.