No problem for a picnic with the family (large areas provided for this purpose) Possibility to bring the cooler but prefer backpacks because there are few large lockers. We had to take two little ones (ie 12 € + 10 € deposit) to put on a picnic, clothes, towels and slides. Ideally take beach slippers (more hygienic). Be patient for the slides if there is no "fast pass" (12 € / person in addition to the entrance, it's expensive) not to mention the waterproof laptop bag (6.50 €) and 5 € for parking Expensive day for a family of 5.