The Prince of Wales and the Duchess of Cornwall arrived in New York from Philadelphia by a private train and visited the Harlem Children's Zone's Promise Academy. The royal couple are on a weekend visit to the United States that focuses on youth development, urban renewal and environmental stewardship.

At the school, they visited an after-school program that teaches middle school students about finances. The participants receive money if their virtual stock investments are successful, and don't lose any money if their picks tank.

Pupil Tiffany Vargas, 13, asked the prince if his multimillion dollar line of organic foods, Duchy Originals, was on the stock market.

"No," the prince told her, "it's still a private company. We haven't got quite to that stage yet."

They then visited a health clinic where children, sitting at computers, learned about asthma.

Charles and Camilla also watched a rehearsal for a Shakespeare play and a basketball practice. Charles, wearing a blue double-breasted blue suit, blue shirt and striped tie, attempted two shots. He missed the first but made the second, drawing applause.

"My son was up all night waiting for this," said Arona Pratt, the mother of one of the players. Pratt said Camilla, who wore a brown coat with a beaded collar and leopard print cuffs, "is pretty."

After visiting the school, the couple went on a terrace giving them a panoramic view of Harlem, including the office building where former President Clinton has an office and the Hotel Theresa, where Cuban leader Fidel Castro stayed decades ago.

On Sunday evening, Charles received an award for his work on behalf of the environment. Former Vice President Gore presented Charles with the Global Environmental Citizen Award, given by the Center for Health and the Global Environment at Harvard Medical School. Gore, who praised the Prince of Wales' knowledge and passion, said he and the prince have had conversations about the global environment for 20 years.

The prince said he was "touched" at being honored, especially by Gore.

"We had great fun talking about all these issues long ago," the prince said. "I've been so fascinated watching his career, and to receive this award from him really has been a particular privilege but also immensely special."

While Charles has won kudos from environmentalists for his calls to action on global warming, British environmentalists have said the prince should have abstained from flying to the United States. In response, Charles' office said it would cancel a skiing trip to Switzerland, a gesture that would reduce his carbon footprint — the carbon dioxide created by his travels.

Earlier in the day, the couple waved to adoring fans in Philadelphia, where they spent the day Saturday, as they walked to a private church service. Afterward, they boarded the New York-bound private train, accompanied by the dean of Temple University's School of Education, C. Kent McGuire and several other Philadelphia-area community leaders.

"The prince was gracious and engaged," said McGuire, who said the prince talked about urban redevelopment and other issues his 17 foundations address.

The couple visited New York once before, in November 2005, when they visited ground zero.

Contributing: Associated Press writer Maryclaire Dale contributed to this report.

Enlarge By Matt Rourke, AP Britain's Prince Charles and Camilla, Duchess of Cornwall, talk before the Academy of Music's 150th Anniversary Concert in Philadelphia, Jan. 27. The royal couple will arrive in New York by train on Sunday.