Hard to suggest restaurants without knowing what you are looking for. Mythos is a highly rated table service, Potter and Simpsons have decent themed quick service locations, and if you're looking for a meal with music loud enough to drown out your mother-in-law, consider Hard Rock Cafe.
I'd suggest a cab. Mears is the contracted cab company for both resorts. Cab will run about $40 or a Town Car $55. To maximize your time, cabs are nice because they run on your schedule.