Inner Mongolia is a big place, and the situation varies from place to place, and Inner Mongolia is not all grasslands. It is best to choose a specific location on the premise of convenient transportation.
3. Recommend a route I have played in the grassland for your reference:
Hefei train or plane to Shenyang, and then transfer to grassland.
First stop to yakeshi: there are two trains from Shenyang to yakeshi, 17 hours;
Yakeshi is located in the transitional zone between Xing 'anling forest region and Hulunbeier grassland, which has both forests and grasslands, with beautiful scenery and is worth visiting. You can stay in several famous leisure resorts in yakeshi.
The second stop: from yakeshi to Hailar (one hour by train), then take a bus from Hailar to Chenbaerhuqi grassland, where you can ride horses, eat roast whole sheep, live in yurts and so on.
Third stop: From Hailar to Hulun Lake Scenic Area, visit Hulun Lake and have a fish feast.
Fourth stop: From Hulun Lake to Manzhouli, it takes an hour or two by car.
From Hailar to Hulun Lake and then to Manzhouli, the grasslands along the way are the most beautiful, which is worth enjoying along the way.
Go back to Hefei directly by train or plane from Manzhouli.