Lanefan
Victoria Rules
Given your example of the journey through the foothills, I'm probably talking about a broader scale than you are.Lanefan, that sounds like Celebrim's "play set".
But I'm curious as to what you mean by pre-designed story.
In my case, the "pre-designed story" might consist of having three or four small adventure paths pre-planned, along with several stand-alone adventures and a vague backstory that might end up tying them all together if I'm lucky.
Then I'll sit down and storyboard, something like:
Adventure A ==> Adventure B ==> Adventure C (by now should know way around local region and have a clue about political history and backstory; and be average 2nd-3rd level)
split party if enough players by then
Group 1 to Adventure path D-H (thwart Ares' plans, meet some important people)
Group 2 to Adventure I ==> Adventure J ==> Adventure K if high enough level (get involved in politics, learn undead lords exist)
New group (3) does Adventure L then merges with one of the pre-existing groups? (find Zeus relic, required later in Adventure T)
etc., etc., along with a long list of throw-in adventures and side-trek ideas.
That's an example of what my pre-designed story might look like, except it would be scribbled out on a piece of paper with lots of crossings out and re-writings and overall be much less legible.
18 months later it might get re-done after Group 1 bails out during Adventure G and goes on a side trek, allowing Ares to bring his plans to fruition and thus changing the future I'd had in mind. I might also re-do it if I have better ideas later and-or the players start coming up with adventure ideas of their own.
Lan-"the storyboard for my current game is now up to version 5.0"-efan