How far in advance for zip line reservations?

[disneysteve]

The zip line safari site says that reservations are required. Does anyone know how far in advance I need to make them? I'd prefer to wait until we are in Florida, see the weather forecast and figure out our schedule (we don't really plan much in advance). Can I just call a few days in advance?

 

[bxmetfan]

Where can you zip line?