A body recovered Friday from the Colorado River within Grand Canyon National Park was thought to be that of a commerical float trip passenger who vanished after falling off a ledge into the river a week ago.

Exploring national parks by water is a great way to get away from the crowds and out into the scenery. If you'd like to hone your skills for this type of adventure, rangers at Bighorn Canyon National Recreation Area in Wyoming and Montana will be offering a guided kayaking program this summer.

Bears have a sweet tooth, too. And that's why the Gregory Bald area at Great Smoky Mountains National Park has been temporarily closed to humans. The reason is the cherry crop that has attracted black bears looking for a tasty meal.

Water provides the energy needed to drive the machinery at Saugus Iron Works National Historic Site, but without waterwheels to capture that energy, well, all that energy would be lost. To keep things running, the park site currently is working on building five new waterwheels by hand. What's missing, though, are some good trees. Large white oak trees, specifically, that can be fashioned into shafts for the waterwheels.