I have a group I am running a bit of a sandbox campaign for. When the group decides on a direction, I just grab some module or scenario that approximates what they are doing and adjust it as needed. This has worked well so far. Now the group is starting a long overland journey. At that point I realized that I don't know any good modules or scenarios built around a long overland trip.
Does anyone know a good adventure I can use? The characters are 10th level and super highly optimized. Any ideas?