There are a wide range of activities at Camille Sée during school hours and on Wednesday afternoons when there are no classes. Lunchtime clubs include the choir, International Section yearbook, school journal, debating, breakdance, chess and other board/card games. The Association Sportive offers numerous sports activities, principally on Wednesday afternoons, such as swimming, table-tennis, climbing, and fitness/hip hop.
International section students regularly participate in Paris-wide competitions including Poetry by Heart, History Bee and Bowl, the French Debating Association high school tournament. For the past two years, lycée students have taken part in the Paris Model United Nations programme.