There is a shuttle that runs every hour. Just go out to the ground transportation area and wait for it. IIRC, they said it's a blue/silver bus that says "Sheraton Bloomington" on it. When I got in yesterday, I had just missed the 6 PM shuttle. Rather than wait another hour, I happened to run across a couple other people going to the hotel and we split a cab. The cab ride is about $27.50, plus a couple extra bucks per person.