Manning, the Super Bowl MVP, joined by coach Tom Coughlin, Bloomberg, Gov. Andrew Cuomo and other teammates, waved and grinned from the float as a deep roar rose from the crowds.
Manning joked about the team's fourth-quarter comebacks.
"Make it tough but make it possible," he said, laughing about how the team blew an early lead to come back and beat the Patriots, 21-17.
The team was introduced with thunderous applause from the thousands of fans outside the City Hall gates. A lucky 250 fans received tickets to the fete, where the Giants were individually honored with symbolic keys to the city.
Among those receiving keys was Giants tight end Jake Ballard, who attended the festivities on crutches because he tore his left anterior cruciate ligament during the second half of the game.
After the parade, the team traveled to New Jersey for an afternoon rally with tens of thousands of fans on their home turf, MetLife Stadium.
Noteworthy *
Baltimore running back Ricky Williams, 34, who has a year left on his contract, said he's retiring. After winning the Heisman Trophy with Texas, Williams broke into the NFL in 1999 with the New Orleans Saints. He had five 1,000-yard rushing seasons over 11 years. He retired previously before the 2004 season when facing a four-game suspension for violating the league's drug policy. He returned in 2005.
* Chicago hired Jeremy Bates as quarterbacks coach, reuniting him with Jay Cutler. Bates was out of the league last season, but he worked with Cutler as an assistant for 3 years in Denver.
* A person familiar with the deal said the New York Jets have re-signed wide receiver Patrick Turner to a 1-year contract. The deal, agreed upon about 10 days ago, is worth $875,000 with a $250,000 signing bonus, according to the person who spoke on condition of anonymity because the team had not announced the signing.
* The NFL suspended Pittsburgh tight end Weslye Saunders for the first four games of the 2012 season for violating the league's policy on performance enhancing substances.
* Denver prosecutors said Broncos running back Knowshon Moreno was charged with drunken driving and careless driving. Police said Moreno was stopped on Feb. 1 after allegedly driving 70 mph in a 45 mph zone.
