Why can galapagos penguins survive in the galapogas islands, despite their cold-weather adaptations?

They stay near the cold water current that flows past the islands (The Cromwell Current)
They return to the water if they get too hot.
The pant as other birds do to cool their gullets
They  stretch out their feet and lean over them to prevent them heating up in the sun

"Attakkdog" was partly right - but when it gets cold, (especially on winter nights), they group tightly together, keeping the ones in the middle "toasty warm", then they circulate, with the ones on the inside moving out to the edge, and the ones on the edge moving in toward the center of the group. This way they all stay acceptably warm.

There is a cold water current that flows up the west coast of South America called the Humboldt Current. It supports huge amounts of nutrients which support vast shoals of anchovies and other fish which, in turn support billions of sea birds. It is the Humboldt current that brough the penguins and fur seals to the Galapagos. The cold Humboldt current is supported by the cold, westerly Cromwell Current.

Only one species of penguin huddles together for warmth and that is the male  Emperor penguins in Antarctica during the winter. Galapagos penguins nest in burrows on equatorial islands, they do not huddle on the ice.