I think playing your bucket list pieces, no matter how badly, can be fun. The pieces you've always wanted to play.
When I was a senior in high school, my piano teacher let me play one of these - Chopin Ballade 1. I really really enjoyed working on that.
When I go back and play it now, many years later, it doesn't have that kind of vibe at all. It's no longer a dream piece.
So, I guess the point is to dive into one of your Dream pieces now and then, no regard for the official learning cycle we adults (and our teachers) put ourselves through.
Then again, some pieces are just fun - like Maple Leaf Rag.