Cabanas are good for a certain number of guests indicated on the booking page under the inclusions. This number of guests is the maximum number included in your booking.
If you do not select the maximum amount of guests at checkout, rest assured your booking will be available for you up to the maximum number included, per the booking page, regardless of the number of guests you selected at checkout.
For example: if a cabana says it is valid for 4 guests, but you selected 1 guest at checkout, you will still be able to have a group of 4 if you change your mind later. If guests arrive separately, they can simply give the main name on the reservation at the front desk to gain admittance.
If you need to add guests above the maximum indicated, all guests will require a pass and this can be booked separately, based on availability.