You can take time to visit iFly Seattle during your travels to Tukwila. Attend a sporting event or visit the shops in this walkable area.
If you want to give your credit card some exercise, head out to Westfield Southcenter Mall in Southcenter. Let yourself be amazed at the art galleries in the area— your cultural tour starts here. It's also full of great shops and restaurants, so you can spend the afternoon having a wander.