Desert sands, old-growth forests, mountain glaciers, spooky caves, dino bones and pig wars. There, I’ve summed up the National Parks for you — but your kids need to see these sights for themselves. Here are seven don’t-miss National Parks in Washington and Oregon, in honor of National Park Week. Can you visit all the parks by the time your offspring turn 18? John Day Fossil Beds (Oregon). Can you imagine dry Eastern Oregon covered with rainforest? It was in prehistoric times. Three separate land areas – or “units” as the NPS calls them – make up the John Day Fossil Beds, a window into the past. Dino bones are still…