Granting access to the outdoor swimming pool partly taxed partly exempt from VAT

A operates an outdoor swimming pool for recreational and educational purposes.
The question is whether the fees received for these services are exempt from VAT. If not, the reduced VAT rate applies.
The parties agree that the services provided by A involve a single composite performance and the kiosk must be excluded from the assessment.
The District Court of Noord-Holland ruled that part of the fees are exempt and part are taxed, allowing A to partially deduct input tax.