Whatt shouldd ii weaar ?? (fashion)?

Tommorow i'm going to a picnic , then biking with my bestfriend , then going to see the movie "monte carlo" . so i need a outfit for that. and then the day after i am going to the mall with my friend , boyfriend , his brother , and his cousin so i also need a outfit for that , a pretty one(: but not to girly . my style is preppy & scene . and im 13