At the recommendation of James Jacobs this is a thread repository of all fan-made guided tours that may have been done in the past or that will get made in the future.
The link above contains one such great example, done by Snasgot, which is a tour of Sandpoint.
Don't be shy and don't be intimidated by Snasgot's hollywood level awesomeness: however how small the contribution it might help a GM communicate the feel of a certain area with his players one of these days!