Native grasslands are one of the most endangered ecosystems in the world. Get up close and personal with them by running the Valley of 1000 Devils – 10.3 KM out and back in the East Block of Grasslands National Park in Saskatchewan. The trail is not marked, but there’s a well-worn footpath that is fairly easy to follow. Temperatures on the trail tend to be 10° Celsius hotter than in the Rock Creek campground, making it essential to take water.