The Café is on the Dining Plan, the Dining Room isn't.
The Dining Room is very formal [and quite expensive] and the Café is more casual [but still quite pricey]. I've eaten at the Café a few times and I love it. Their Filet Mignon is exquisite and their Crab Cakes are devine! It's a "California" style menu [a lot of things on the menu I had to ask what they were - all good, but the menu didn't always seem clear] and their desserts are absolutely heavenly!