President Obama, Mexican counterpart Felipe Calderon (center) and Canadian Prime Minister Stephen Harper pose for an official photo at the Cabanas Cultural Center in Guadalajara, Mexico on Monday. Obama took part in his first summit of North American leaders in Mexico, with swine flu, Mexico's drug cartels and economic blight on the agenda.
Jewel Samad/AFP/Getty Images
Passengers on a whale-watching ship in Massachusetts Bay. Whale watching is one of many recreational activities that draw people to the waters off the coast of Massachusetts.
Kerry Crisley/The Nature Conservancy