I just wrote up a similar course and could not find any sample data to my liking. I started with Adventureworks but due to the multiple schema's decided against it for my class. went with a much simpler setup using only the default schema. i also looked at it as a good exercise for generating random test data. Really helped me in that area and i now am much more confident at creating the random data for testing queries if i dont have nice production data.

EDIT: I was able to find the CREATE TABLE and data inserts for the DB i used. It is based off of the script from Essential SQL on SQL Server 2008 by Sikha Bagui with some rather heavy modifications by me to better suit the 5 day course i wrote.