2 adjectives to describe toboggan

I would make a solemn affidavit to the fact that the maker of a baby-carriage never dreamed of its possible use as an impromptu toboggan for a couple of small boys to coast downhill on in midsummer.

Ten minutes after that they were sliding down a muddy toboggan which they had revived by splashing water upon the incline made and provided by the town boys for scudding.

2 adjectives to describe  toboggan