I've been chatting with a friend of mine about table-top gaming and how to avoid railroads but still have a semi-structured and cohesive plot for a campaign. It can be cool to want to run an epic adventure module with friends, especially some of the adventure paths like Age of Worms or Rise of the Runelords. As much as I like sandbox gaming with a bold group of players, sometimes I do long for a more structured adventure path that still takes into account the actions of the players. So to answer my friend, I remember something told to me by my lead cook.
One of the things his old boss talked about was called "blowing the bridge". Basically, the bridge is some goal or task that needs to get done. It doesn't matter how the bridge is blown, as long as it's blown up by the time he gets back. In this case, the bridge could be cleaning the kitchen, or getting through some prep quickly, or pushing through a rough service. He doesn't care if someone takes a lot of smoke breaks, eats on the job, or imbibes in their chefly vice (nose candy is fairly popular in the food industry), as long as ultimately the job gets done correctly and by the deadline.
Now, say what you will about the philosophy in terms of physical and mental health of a chef (and believe me, we are not mentally healthy in the slightest), the idea is something that has stuck with me when I design my campaigns. For me, when I have some scenario in mind for the players to run through, I segment the goal of the players as the proverbial 'bridge'. I try not to throw too many limitations on their methods, though I am a believe that limitations breed innovation. But in general, I don't care how the players blow the bridge, as long as they go and accomplish their goal. Now, depending on the method of blowing the bridge, it can lead to some serious fallout and consequences. Which for me is great, since the players are literally doing my adventure hook creation job for me. So with that, even in a more structured adventure path/module/fox hunt style of game, you can still have the freedom of player ingenuity and cleverness take the forefront to tacking a problem.