RIDING INTO HALEAKALA CRATER, Hawaii National Park. In a detached section of Hawaii National Park, on the Island of Maui, is the summit of Haleakala, a 10,000-foot-high volcano apparently in the last stages of activity. Its eruptions are infrequent, probably several centuries apart. The last was about 200 years ago. The great summit depression of Haleakala, one of the largest volcanic craters known, has an expanse of over 19 square miles, most of it lying 2,500 feet below the high western rim. It is a real thrill to motor to the rim of Haleakala, then go by horseback down into the crater. A lodge high on the mountain furnishes over night and meal accommodations. (Photograph by Werner Stoy.)

THERE'S A REGATTA GOING ON, Lake Mead Recreation Area. Literally thousands line the shore of Lake Mead to watch a regatta. Since the lake is the reservoir formed by the great Hoover Dam, and is therefore man-made, spectator sports are not considered non-conforming recreational uses as they would be in a national park. The opportunity to enjoy water sports in this vast semidesert region makes Lake Mead Recreation Area the second most heavily visited of the areas administered by the National Park Service.