I've loved the Chimani National Park guides. They're chock full of worthwhile information and are well worth the US$4.99 to 9.99 they usually sell for.
Beginning April 17, the apps are free in celebration of National Park Week. This great deal will last through April 29.
"Last year we gave away over 100,000 apps during National Park Week. It was a huge success, and we're excited to do it again," said Chimani President Kerry Gallivan. "Our goal is to reach a million downloads this year and to encourage just as many people to visit their local national park."
The Chimani suite of national park apps includes Acadia National Park, Cape Cod National Seashore, Cuyahoga Valley National Park, Grand Canyon