I don't know about Minnesota but check out A Closer Look and Intelli-Shop. They have some that are more of "the normal basic hotels." Do those for practice so you won't have so much money tied up. Then you can go up to the higher class ones.
Be sure to check Trip Adviser, etc. to know what you are getting into. Some of them are on the boards for a reason such as they need to know what is wrong. Remember that most hotel shops have a few required pictures then pictures of anything else that is wrong. If there is a lot wrong, then there is more work involved. The bonus should be higher to make up for it. Also, check to be sure that there is good security before signing up as it is not worth a bonus if you end up in a crime-ridden location and get shot.
Shopping across Indiana but mostly around Indianapolis.