Coronado Springs has a lovely terrace on the water outside of the Maya Grill and the Pepper Market. If you decide you want a romantic evening at the resort, here is my recommendation... get a nice bottle of wine or champagne, and find a cozy spot on the terrace. Watch the sun set over the water, and watch as the Mayan Temple tower starts to glow. Then, as night sets, watch the fireworks from Illuminations over the water in the distance. It's really wonderful!
Don't forget to mention it's your 10th Anniversary, and your second honeymoon!! Coronado Springs sprinkled our stay with a lot of magic during our honeymoon - a free upgrade to a Junior Suite, a free bottle of champagne, and 2 free drinks at the pool bar!
As Misti said, the Electrical Water Pagaent would be nice to watch. If it's warm enough, sneak off to the beach at the Polynesian and snag a hammock to snuggle in together and watch the show. If the MK Fireworks are on that night, you can watch them from there.
Another restaurant not to miss... dinner at Artist Point in the Wilderness Lodge!