The ideas are definitely flowing! Role-playing and dress-up sound like so much fun, bringing out the kid in us too!
I'm thinking along the lines of an at-home spa day for little rewards - painting nails, giving foot massages, and making DIY face masks. A little indulgence never hurt anyone, teaching them a thing or two about self-care early on! Or how about an outdoor movie night? Setting up a mini projector outside under the stars is a cute way to end the week with some relaxed fun.
Any parent will tell you that the best activities are the unexpected ones that create lasting memories!