Disney music CDs in the car for the short rides to/between/from the parks.
If you're driving down and will have a DVD player or VCR in the car, bring a Disney DVD/VHS tape or two.
Disney beanie toys for bedtime (bring a couple as a surprise) and/or the car rides.
Get Mickey ice cream novelties at the grocer for your condo freezer and take them out when you walk down to the pool.
When you shop for groceries, see if they have any Disney helium mylar balloons. Tie one to the bed frame or dresser drawer - they last for a week or more.
If you'll eat breakfast in (cook), make Mickey-head mini-pancakes.
If you plan to eat outdoors or poolside during lunch/nap/swim breaks and you'll be getting paper goods anyway, bring a pack of Disney birthday paper plates or napkins or cups - again, look in local discount stores.
Pack some new Disney t-shirts or princess tiaras (can pick them up cheaply at discount stores or outlets) to surprise the kids in the mornings.
If you have Disney toiletries leftover from previous trips, pack them. If not, and if your room will have a large jacuzzi (many do!), bring some Disney bath bubbles but remember - a capful goes a long way in a jacuzzi.
If you'll be bringing coloring books for the car/plane ride, get Disney ones - they're often at Dollar Tree and similar stores.
There are lots of little things you can do. But I agree with Brian, they may be more for us grown-ups than for the kids. The parks provide for plenty of "Disney" for the kids, who may actually welcome a breather from such heavy stimulation when they're back at the condo. Ours always have.
