Herbology Class: Planting, and Chinese cabbage (it's funny, and a very good idea)
Library: Catch the flying books for Cressida Blume.
Potion class: Brew the first Wiggenfeld Potion, help a Weasley. (Do not regret it xD.) Few more potions. (Edurus, Felix Felicis)
Go out from the castle to mett Natty. (Just I started.)