"We'd hate to have to live through this all over again," Richard Marcus, a 29-year employee of the National Archives in Washington, said after the government shutdown finally ended.
Nationwide, from big-city office buildings to wilderness outposts, innumerable federal services and operations shifted back into gear after 16 days.
The U.S. Forest Service started lifting a logging ban on national forests. U.S. Citizenship and Immigration Services restarted the computerized system used to verify the legal status of workers. Boat trips resumed to Alcatraz, the former federal prison in San Francisco Bay, with 1,600 tickets snapped up by tourists in the first hour of business.
In Alaska, federal officials rushed to get the red king crab fishing season underway. The opening had been delayed because furloughed workers were not around to issue crab-quota permits.
National Park Service Director Jonathan Jarvis said all 401 national park units — from the Golden Gate National Recreation Area in California to Acadia National Park in Maine — were reopening Thursday.
More than 20,000 National Park Service employees had been among the 800,000 federal workers sent home at the peak of the shutdown.
Visitors from around the world flocked to Yosemite National Park to see such famous sites as El Capitan and Half Dome after weeks of closure brought local economies to a near standstill.
At Yellowstone and Grand Teton national parks, employees were busy with reopening chores. They returned just in time to begin closing the parks up again for the winter in a couple of weeks.
At Philadelphia's Independence National Historical Park, one couple's long wait to see the Liberty Bell and other attractions finally drew to a close.
Karen and Richard Dodds of Oklahoma City were on a quest to see every national park in the U.S. They arrived in Philadelphia about three weeks ago in their motor home, visiting Valley Forge just before the shutdown. They stayed on in the area, awaiting a settlement.
"They didn't solve anything by this," Katie Dodds said of the temporary agreement in Congress that funds the government only through Jan. 15 and gives it the borrowing authority it needs only through Feb. 7. "The worst part is they'll do it again in January and February."
Among the many sites reopening in Washington were the Smithsonian Institution's museums and the World War II memorial on the National Mall, which had been the scene of protests over the shutdown.
Smithsonian spokeswoman Linda St. Thomas said the museum complex lost about $2.8 million in revenue during the shutdown.
The National Zoo was set to reopen Friday, though its popular panda cam went live Thursday morning, giving fans a view of a cub wriggling about as its mother, Mei Xiang, tucked her paws under her chin and watched.
Federal workers who were furloughed or worked without pay during the shutdown will get back pay in their next paychecks, which for most employees come Oct. 29.
Labour Secretary Thomas Perez greeted returning workers with a sympathetic email.
"Unfortunately, as President Obama correctly noted, you are occasionally called on to perform your remarkably important work in a climate that too often treats federal employees and contractors as a punching bag," Perez said.
The Defence Department called back about 7,000 furloughed civilians. In an open letter to the workforce, Defence Secretary Chuck Hagel said the department still faces budget uncertainty as Congress struggles to pass a 2014 spending bill and deal with automatic budget cuts. Pentagon Comptroller Robert Hale said the department lost at least $600 million worth of productivity during the four days that civilians were furloughed.
The National Institutes of Health warned university scientists not to expect a quick resumption of research dollars.
At the National Institute of Standards and Technology in Gaithersburg, Md., email servers were slowly grinding back into gear.
Fire protection engineer Dan Madrzykowski had been in the office for about half an hour and about 800 emails had popped into his inbox. And that represented less than a week of the shutdown. Still, Madrzykowski said he was pleased to be back.
"Nothing good was coming from keeping the government closed," he said.
Patrice Roberts, who works for Homeland Security, said she wasn't prepared for the emotional lows of the past 16 days.
"It's just frustrating having that kind of control over your life and just having it taken away from me," said Roberts, who is expecting another shutdown in January. "I'll be better prepared next time."
In Pottsville, Pa., several people waited outside the Social Security office ahead of its 9 a.m. opening. James Ulrich, an unemployed 19-year-old, needed a replacement for his lost Social Security card to apply for jobs. He was told a replacement card would take two weeks to arrive.
"I don't have a really good outlook on the government," he said.
In Cincinnati, Renee Yankey, a government alcohol and tobacco tax specialist, was sleep-deprived after staying up late to watch news of the shutdown-ending deal, but otherwise glad to be back at work with the Alcohol and Tobacco Tax and Trade Bureau.
"I can tell that the alcohol industry missed us," Yankey said. "The first thing I hear is 'I'm so glad I got a person on the phone!'"
In North Little Rock, Ark, Simeon Yates was glad to return to work as an auditor for the Arkansas National Guard.
"It's definitely a relief financially ... knowing that we'll be able to provide for our families again," said Yates, whose wife stays home with their four young children.
"It was hard to explain to the kids," Yates added. "They enjoyed having me home, but when we were just having hot dogs a lot and pancakes ... you know, being small, they didn't necessarily understand that."
Associated Press writers Matthew Barakat in Reston, Va.; Ben Nuckols in Springfield, Va.; Dan Sewell in Cincinnati; Michael Rubinkam in Pottsville, Pa.; Jeannie Nuss in North Little Rock, Ark.; Kathy Matheson in Philadelphia; Rachel D'Oro in Anchorage, Alaska; and Jessica Gresko and Sam Hananel in Washington contributed to this report.