sled down something
to ride down something on a sled. I love to sled down the hill in the winter. This hill is too steep to sled down safely.
sled over something
to travel over something, such as snow, in a sled. We sledded rapidly over the fresh snow, scooting down the hill. We wanted to sled over the new snow, but we had to wait until Uncle Herman had taken a picture of it for his scrapbook.