The government's dietary recommendations are 200 IUs a day up to age 50, 400 IUs to age 70, and 600 IUs over 70. But many experts believe that these recommendations are far too low to maintain healthful vitamin D levels.
Crater Lake National Park. Crater Lake National Park is a United States National Park located in southern Oregon. Established in 1902, Crater Lake National Park is the fifth-oldest national park in the U.S. and the only national park in Oregon. The park encompasses the caldera of Crater Lake, a remnant of a destroyed volcano, Mount Mazama, and the surrounding hills and forests.
The remaining 0.9 miles of the trail are steeper and rocky at times but manageable for hikers of varying skill levels; keep in mind, though, that you will gain more than 2,500 feet in elevation during the hike. Mirror Lake is the first lake hikers will access with Crater Lake a mere 0.2 miles up the trail.