Daniela Fernández, any day you can buy tickets, even if you buy them in advance on the Internet, they are cheaper. Islands worth visiting is a fun and wonderful place for the whole family in general. Sorry, I thought I misunderstood the question, in effect the ticket is used only for the day and date indicated, not before not later, because if you want to use it after the date, you lose it. And if you want to use them before, it would be a problem with the administration, you would have to request cancellation and a new ticket date and if you could but it is very complicated.
Pick tickets up the day you picked to go
Whenever a ticket is picked up, will call, at the gate, you have a limited amount of time to use that ticket. You usually have flexibility on when you decide to pick up your tickets.
You must definitely use them on the day indicated or it is lost.
You have to use them on the day you picked
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