I'd like to see opinions, suggestions and comments on this topic.
When creating adventures for you game group, do you pre-plot everything out, or do you give your players a wide open "sandbox" to go where they like?
I tend to do a little of both. Since no adventure survives player actions unmauled, I tend to outline events and encounters, but leave them general enough that they can be easily modified if the players decide to go left instead of right.