Your second day free is included in your park ticket, I am not sure about Busch Gardens, but know this is true for Sea World, I have done it a few times! Pretty much any ticket you buy for SW includes your 2nd day free, you just have to make sure you get it validated at a guest services desk before leaving the park that day! I am pretty sure the same is true for Busch Gardens, but don't thinks so for Aquatica! Hope this helps!
Under details on the ticketing page for Seaworld for there 1 day ticket, I copied and pasted this...
1 Park
Seaworld
•Enjoy one visit to SeaWorld anytime within one year of purchase.
•2nd Visit Free offers the flexibility to return a second day so you can experience SeaWorld on your schedule.
•2nd Visit Free is valid for one additional visit to SeaWorld during regularly scheduled park hours for up to 7 consecutive days from the date of the first visit at no extra charge.
•This offer is not to be combined with any other special offers or discounts. Tickets are Non-Transferable and Non-Refundable.
* Price is per person, plus tax and subject to change without notice. Tickets are non-transferable and non-refundable. Offer not valid with other discounts or special offers. Does not include admission to select special events, parking or discounts on food or merchandise. Other restrictions appl
FOund the same for Busch Gardens, hope it answers your questions,
1 Park
Busch Gardens
Enjoy one visit to Busch Gardens anytime within one year of purchase.
2nd Visit Free offers the flexibility to return a second day so you can experience Busch Gardens on your schedule.
2nd Visit Free is valid for one additional visit to Busch Gardens during regularly scheduled park hours for up to 7 consecutive days from the date of the first visit at no extra charge.
This offer is not to be combined with any other special offers or discounts.
Tickets are Non-Transferable and Non-Refundable.
