If you possess a legal US passport, you can travel to 184 countries and territories without the need for a tourist visa or even visa on arrival. You can check whether your tourist destination comes under the list of visa-free countries for US travelers.
According to the Henley Passport Index, the United States passport ranks 6th with respect to travel
Here are some examples of countries that put conditions on American tourists. Keep these things in mind while traveling to one of these 184 countries and territories.
Antigua and Barbuda
There are strict rules in place that require you to provide proof of sufficient funds during your stay. Also, there is a requirement to furnish the return ticket and accommodation details.
You need to arrive and depart this country it only through the Minsk International Airport. Visits to the Belovezhskaya Pushcha National Park are only allowed for a maximum of three days, for visa-free travelers. Grodno and Augustow Canal can only be visited by visa free tourists for up to five days. Apart from this, proper registration is mandatory if you want to stay in Belarus for more than 5 days.
While you don’t need a visa to enter, you do need to pay a departure fee when you leave the country to return home.
Bosnia and Herzegovina
You need to undergo registration with the local police within 24 hours of your arrival.
Anyone with a criminal record (including misbehavior or driving offenses related to alcohol) cannot enter Canada unless they obtain rehabilitation approval or a Temporary Resident Permit.
If you are a Colombian-born US citizen or are traveling with children, you will need to complete some special exit formalities.
You need to be able to provide a proof of health insurance.
An exit tax needs to be paid when you leave the country by air.
People with dual citizenship of the US and Israel, but without an Israeli passport need to get one to leave the country. Entry is prohibited for anyone who has knowingly issued a public call for boycotting Israel.
People who enter the country through land and travel more than 20 kms into Mexico, or intend to stay for more than 72 hours must obtain a valid Forma Migratoria Multiple document.
If you have a criminal conviction in your history, you will not be allowed to enter the country.
You should possess an International Certificate of Vaccination.
Above all, make sure you are clear and confident about the purpose of your visit. This will help avoid any unnecessary trouble during your stay.