Question: Do You Need a Passport to Go to Puerto Rico?
No, you do not need a passport to go to Puerto Rico if you are a US citizen. Puerto Rico is a US territory, and US citizens do not need a passport to go to Puerto Rico or any other US territory -- traveling to a US territory from the mainland United States is the same as driving from Illinois to Iowa, or taking a plane from New York to Los Angeles. You're still within the United States' legal jurisdiction. And, know that Puerto Rico's drinking age is 18, so not only do you not need a passport to go to Puerto Rico, but if you're under 21, you can grab a cold beer on a warm beach when you get to this cool Caribbean island. See more about US territories, passports, spring break, and all that good jazz:
Everything you need to know about passports: where, when, how, and what:
And everything you need to know about spring break -- most especially where, when, how and what (and how much!):
US Territories, Drinking Ages
US commonwealths/territories are American Samoa, Baker Island, Howland Island, Guam, Jarvis Island, Johnston Atoll, Kingman Reef, Midway Islands, Navassa Island, Northern Mariana Islands, Palau, Palmyra Atoll, Puerto Rico, US Virgin Islands (St. Croix, St. John and St. Thomas), and Wake Island.