If you drop TWO clubs in which you are NOT INTERESTED, why pick up TWO new clubs?
ONE club, in which you are a passionate member, will look better on your record than three or four in which you truly have little interest beyond resume packing. For instance, which do you think looks better to an admissions counselor:
Scenario A
Sound Academics
Mediocre Athleticism
Four Clubs (Art, National HOnor Society, French, and Biology), no leadership (no president, secretary, scheduler... etc).
100 volunteer hours (at ten different venues)
Chorus I-IV (all four years)
Babysitting
Trip to Latin America (they call it a Mission Trip, but what you mostly did was play soccer with kids who are already playing soccer)
Scenario B
Sound Academics
Up-trending Athleticism
Fencing Club (Founder, President, Nationally-ranked, Event Scheduler, Certified Director (referee in fencer lingo), three-weapon rating)
Chorus 1-IV
Eagle Scout
400 Volunteer hours at local animal shelter (certified)
20 hour per week job at Burger Flipper; promoted to Manager of Cups and Napkins after four months.
Every spring break spent working 50 hours in local nursing home.
Evaluation:
Scenario A is ok academically but spread out in four clubs with no officership, meh... Obviously, that fencing is going to get you into the Academy, and will teach you lots of valuable skills.