Tobogganing

from WordNet (r) 3.0 (2006)

tobogganing
    n 1: riding on a long light sled with low handrails

from The Collaborative International Dictionary of English v.0.48

Toboggan \To*bog"gan\, v. i. [imp. & p. p. {Tobogganed}; p. pr.
   & vb. n. {Tobogganing}.]
   To slide down hill over the snow or ice on a toboggan.
   --Barilett.
   [1913 Webster] Tobogganer