Love this park! It's close to the Mammoth hot springs and is open all year round. We were at site #22. Great views and the sites are big enough for 30 ft trailers. We drove around Yellowstone and encountered Bison crossing the road. Being that it was April 2, this was the only park open but it was still a great experience because it was not busy at this time. Would definitely come back again for mid April (15th) when all the other parks and roads open up.