What were the cycling tracks like in the very first olympics?

Answer 1

There weren't any.

Olympic games, as held by ancient Greece, was a long time before the invention of the bicycle. No bikes, no race, no race track.

Cycling didn't become a part of the Olympics until the modern olympics were started, and cycling got added in 1896.

The tracks themselves were pretty much like they are today. Mybe a bit poorer light, maybe a tiny bit more uneven.