Inner Mongolia.

Wow, your plan sounds amazing! Hulunbuir is such a beautiful place. It's a shame you didn't get to go last year. Your self-driving route is also great, every place is so much fun! Especially the Kaxian, I heard it was super beautiful before, and it must be more enjoyable to drive by yourself. But speaking of travel tips in Inner Mongolia, I think in addition to a windbreaker and a thick coat, you also need to bring sunscreen and sunglasses, because the sun there is really strong, especially on the grassland, there is no shelter, it is easy to get sunburned. In addition, you can't miss the delicious food in Inner Mongolia! Lamb skewers, roast whole lamb, beef noodles, I'm drooling just thinking about it. Oh, I'm so tempted, I really want to go to Hulunbuir too! You must have a great time this time and make up for the regrets of last year!