Are you taking a towncar? They would be glad to go to a drive thru for you on the way there.
I think Planet Hollywood is still open that late, and I'm almost positive that ESPN Club at the Boardwalk serves unti 1 or 2 AM but on a reduced menu. McDonalds might also be open (Downtown Disney or by All Stars).
You could get back and forth between Coronado and the Boardwalk via a special bus that goes from CSR to BW then to DD; at least that was how it was done last year, it may have changed since then. You could always take this bus and walk over to Tubbis at the Dolphin.
I also know that the Grand Floridian food court is open 24 hrs, and I think the Contemporary and Polynesian food courts are as well.
You could also go to Pleasure Island, the stands there are open until 2 AM, but I wouldn't do that unless you had an Annual Pass or a park hopper with a plus feature that would go unused the rest of the trip (on an unlimited park hopper, you could eliminate that 1st night to save $, therefore it wouldn't be worth it IMHO).