Badlands National Park in May with Spring Rains offers many advantages. It is not overly hot, and the recent rains bring out colors. The very best time to see Badlands National Park is when a Thunder Storm is approaching and just after a thunderstorm has passed when rainbows are out (after 4 PM or so or before 10 AM). Just after a good spring rain, like we did in early May, is the next best time. Our favorite parts are the Door Trail, where you go through a door into another world, and the Yellow Mounds (the picture with an RV, no it is not ours). There are many good surprises in the Badlands. http://www.travelingmorgans.com/SD/BadlandsNP.shtml, our Badlands Web Section, will soon be updated with these new pictures.