When you're talking about the cinema, add what kind of movies you like, the genre... You also can justify your choices : why do you like shopping? Have a lot of clothes, just try it for fun... Why do you prefer mexican or chinese food? It's spicy, it's healthy...
And for the cooking part, you can justify why you prefer desserts (cuisiner des desserts = faire de la patisserie, if you want more vocabulary). Because it's sweety, or Anything you can find.
Have 50 words is pretty short finally. You could do more than that easily, you just have to find where ;)