How they did this, The World's First KOA invites you to enjoy its historic setting along the scenic Yellowstone River. Cute, helpful sigge throughout. Lisa, Google Review. From walking around the rv park their facilities and campsites are maintained. Patricia, Google Review, Image Source: Better have earplugs tho.its right off the highway. The RV trailer length can be no more than 30 feet. Pool: Memorial Weekend - Labor Day Weekend. With 2 trains at night. Best of all, Grandview Campground & RV Park features a fully-stocked camp store. There are vault toilets on site but no potable water or trash services. Even if its nearing the end of the traditional camping season in Montana, that doesnt mean youve got to pack up your gear for the year.