Stone stairs

[Arcanist]

you should be able to jump down cliffs for 10% shp dammage or something

[Shruikan]

+1

edit:

you should be able to jump down cliffs for 10% shp dammage or something

+1

[100Rads]

10% shp is a bit too much... Imagine getting of a mountain

[SacreDoom]

Also your character would have to be pretty retarded to hurt himself that badly from like a 1½ meter jump.

[100Rads]

Maybe a stamina drain instead of shp damage. Just as SacreDoom stated above, you hearthling should be very retarded to get hurt from such a fall.
I was bored so I made a little picture with stone stairs and retarded hearthlings:

[FictionRyu]

That looks quite real. This stair idea is superb.

[shotgunn902]

i also find this good and it makes cliffs much less damaging to a village

[mvgulik]

Right ... should only be possible to be build upwards.
Just ditch a ton of sand to create a slide from above (nope, it won't allow you to walk back up.)

[100Rads]

It would be kind of dumb to have 1 way stairs. The sand slope actually seems like a nice idea for players without resources/lazy players, because chipping 100 stones takes quite a long time without a pickaxe.

Also, how about a skill called Climbing. It would unlock a "Climb" option in the Adventure Menu, which when used on cliffs would make an animation of your hearthling climbing the cliff, or maybe just teleport him/her up the cliff. It would cost 500 LP, and climbing up/down a cliff would drain 5% stamina or 10 units from your hunger bar. I even made a little climb button for the adventure menu, but I can't upload it right now. I will upload it later.

EDIT: Basic terraforming options would actually allow you to remove those pesky logs stuck on the cliffs
Also,

The ability to produce and remove cliffs

Producing cliffs seems like a bad idea. Palisades and brickwalls would become useless, and a lot of illegal HV's would start popping up all over the place. But then again, you could remove cliffs.

[mvgulik]

It would be kind of dumb to have 1 way stairs.

Yep. But nobody sad anything about the stairs themselves being one way now did they. (building it would be a one way process.)