At the end of trimester one, you'll be writing a "best piece." This will be a piece you'll work on independently throughout the trimester. It could come from a free write, independent writing, inspiration from another story, and so on. The only requirements are that it has to be narrative, at least a page, and show your understanding of narrative writing--so, it should tell a story, use description and literary elements (like theme, plot, characters, etc.), and you should consider it your best work of the trimester.
It could be. . .
a collection of poems
another short story
a memoir piece
a few journal entries
a collection of songs (written by you, of course!)