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 lake is often enveloped in heavy snow during the fall, winter, and spring, forcing the closure of roads and trails. In fact, the lake averages 533 inches of snow a year. Consequently, the best time to visit Crater Lake is in the summer months, when all facilities, roads, and trails are open. All waters in the park are open to fishing and no license is required. 2  Fishing is allowed in the park from 1/2 hour before sunrise to 1/2 hour after sunset. 3  All waters are restricted to use of artificial lures and flies only. 4  No organic bait of any kind can be used in Crater Lake National Park.