I think it will be hard to find a lot of support for a relation type grouping
sled runs, parking, restaurants, etc...
All the additional features can be found easily in OSM: they are close to the
run itself.
For the walking parts, highway=path or else, or maybe piste:type=hike or
connection if nothing remains in summer are already walkable and routable to
connect the sled run to the rest of the world.
In any case, this does not mean sledding doesn't deserve a nice documentation
page in the wiki!
Yves
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