It's Why Not Write Wednesday, which happens to be one of our favorite days here at "Take My Word For It!". Do you have a favorite day? Why not write about it?
Start by answering these questions:
When was it? What did you do? Were you with anyone?
Describe the day using as much sensory detail as you can, to make the reader feel as if they experienced the day with you.
Or, maybe your favorite day hasn't happened yet, but you know exactly what you'd do/see/say. Plan your favorite day as if you're experiencing it as you write.