Indy in DL, the Soundsational Parade, and Remember Dreams Come True which are much better than their WDW counterparts. Take the time to get a good view of the fireworks where you can see the Castle and Matterhorn, if will be running on Friday to Sunday only. Many of the rides in DL are different than thier MK couterparts so you might try them too. Revisit Mr. Toad while you have a chance. Pirates of the Carribean is much better in DL, if you don't remember this you might want to refresh your memory. Also maybe eat at Blue Bayou near the waters of POTC.
In DCA, for sure World of Color. You can ride the little mermaid before the one in MK opens. Also Toy Story and Soaring though the same have much shorter lines. If you like Fantasyland style dark rides and Monsters Inc, thier ride is great. California Screamin is a great roller coaster.
Also you can ride in the front and back of the monorail at DLR.
For food, DLR is has changed a lot of menus to some tasty items. Hungry Bear, Village Haus, Jolly Holiday Bakery, (<-DL DCA->)Boardwalk Pier Pizza and Pasta and the Paradise Garden Grill have the new stuff. I like the Alfresco Lounge in DCA to get a drink and snack at.
If you are a big fan, A Walk In Walt's Footsteps tour may be a good option.