Baking Station - built-in power cord for mixers, blenders, and other appliances with retracting doors. Put some big drawers underneath for baking ingredients (canisters of flour, sugar, etc.) and tools/utensils.
Adults need to have fun too! Any slide for adults in a house is a great idea, but this one contains a water slide. Excellent choice of transportation and you can even get a shower on the way out of bed going down to get breakfast!