Technicality on 2nd day free at Sea World?

[jasper]

If you visit Sea World on a Saturday, and get the 2nd day free pass, can it be used the following Saturday (7 days later), or does it have to be used by Friday, which is the 7th day including the day of the original visit?

 

[vernon]

My understanding is it has to be used by the Friday, in the example you gave.