Those looking to enjoy nature while avoiding the worst of the summer heat can take advantage of White Summer, a Parks and Nature Authority initiative which sees a number of the country's national parks extending their opening hours to allow for night-time visits this week. Guests can marvel at the remarkable formations of the Soreq stalactite caves until 9 p.m. this Wednesday and Thursday. An explanatory slide-show highlights configurations resembling everyday items such as such as shelves and blankets, and coral. At nearby Beit Guvrin visitors can gain an insight into the biblical dramas which took place in some of the Park's hundreds of caves with atmospheric lantern-lit guided tours running on Monday and Wednesday. The more adventurous can wade in knee-length water in some of the caves. The tour is suitable for ages 8 and up. Families can camp under the stars tonight at Yarkon National Park's "Hotel of Many Stars." Showers, bathrooms and wood for campfires are provided, but guests must bring their own tents, sleeping bags and food. Participants can get a close-up of the sky at night at an astronomy presentation complete with telescopes. The experience rounds off with a Saturday morning hike along the Yarkon river bank. For more information about any of the events call *3639 or visit www.parks.org.il.