Talk about happy campers. The Iowa D-N-R is offering incentives to get people to try overnighting in state parks this spring and summer. Frequent campers need to save their registration slips. The D-N-R’s Ross Harrison says campers who stay in at least ten Iowa parks from a select list can qualify for prizes like a free week of camping, a two-person kayak or a five-thousand dollar camper/trailer.Those who camp in at least four selected state parks before October 31st can get treats like T-shirts or a subscription to the D-N-R’s “Iowa Conservationist” magazine. Harrison says you can get full details on the prizes just by stopping at any Iowa state park.For more information, surf to “exploreiowaparks.com”. The 18 parks include: Beeds Lake, Franklin County; Bellevue, Jackson County; Dolliver, Webster County; Honey Creek, Appanoose County; Lacey Keosauqua, Van Buren County; Lake of Three Fires, Taylor County; Lake Wapello, Davis County; Lewis & Clark, Monona County; Palisades-Kepler, Linn County; Pilot Knob, Winnebago County; Prairie Rose, Shelby County; Red Haw, Lucas County; Stone, Woodbury County; Union Grove, Tama County; Walnut Woods, Polk County; Wapsipinicon, Jones County; and Waubonsie, Fremont County.