To add more participants, the most secure way is to create a new booking for the additional people you'd like to include. We can't directly add participants to an existing booking due to the encryption of payment details for security reasons. Alternatively, if you prefer to modify your booking, you can choose to cancel your current booking and then rebook it for the updated total number of participants. Before proceeding with the cancellation, we recommend reviewing the booking's cancellation policy and ensuring that your chosen activity can accommodate the desired number of participants. This way, we can ensure your booking remains as smooth and secure as possible.