Is there a right kind of anthill to sit on?
If you’re an ant, sure!
I used to play on top of a giant (for a kid me, anyway) anthill in a nearby forest.
That's how I learned that forest ants, at least the local ones, are incredibly docile. I never got bothered by them.
In my area, the wrong kind of anthill contains anything in the genus Myrmecia, and the right kind contains almost anything else.