St Lucia is a beautiful island located in the Caribbean, and it's a popular vacation destination for Americans.
If you're an American citizen planning a vacation to Saint Lucia, the answer to the question "Do I need a US passport?" is, unfortunately, a resounding yes. All US citizens are required to present a valid passport when traveling to the Caribbean island nation.
So before you pack your bags, make sure you have your passport squared away. Once you have your passport in hand, you're ready to start planning your dream vacation. Bon, voyage!