Anyway, is it possible to explore it with such small kids? Even at a very low pace?

Hi, We are a copuple with 2 small kids (5 and 3 year old). We have read about sectors in the great wall and seems that Mutianyu is what we look for, not so crowded and thematic park as Vadaling seems to be, but apparently not so hard as Siminati. It is just complicated or not recommended? Thanks a lot!