During National Park Week in April, travelers can take advantage of four days of free entry at national park sites from coast to coast. Details: National Park Week runs from Saturday to April 23, a time when parks host special events for visitors. Explore Saguaro National Park in Tucson, Ariz., by day and then return at night for a star-gazing party April 20. Saguaro National Park, about 20 miles east of Tucson, is throwing a free star party 7 p.m. April 20. Red-hot lava spews skyward from the Kilauea volcano as visitors to Hawaii Volcanoes National Park ob National Park Service Red-hot lava spews skyward from the Kilauea volcano as visitors to Hawaii Volcanoes National Park observe from a safe distance.

Source: Los Angeles Times April 12, 2017 13:30 UTC