The Platinum Passport is listed as an 8 park pass and valid for 2 yrs.
Here's the info I got from the SW Orlando website.
Busch Gardens Tampa Bay, SeaWorld Orlando & Adventure Island Platinum Passport
The Platinum Passport entitles you to admission and benefits at all participating Anheuser-Busch Adventure Parks*
* UNLIMITED Two-year admission to Busch Gardens Tampa Bay, SeaWorld Orlando, Adventure Island, Busch Gardens Williamsburg, Water Country U.S.A (VA), SeaWorld San Diego, SeaWorld San Antonio and Sesame Place (PA)*
* 10% discount on food and beverages at Anheuser-Busch Adventure Parks listed
* 10% discounts on Merchandise at Anheuser-Busch Adventure Parks listed
* FREE General Parking at all Anheuser-Busch Adventure Parks listed (Adult Passports Only)
Enjoy these Home Park benefits at Busch Gardens Tampa Bay, SeaWorld Orlando and Adventure Island only:
* $1 discount on half-hour boat rentals at SeaWorld Orlando.
* FREE Preferred Parking at Busch Gardens Tampa Bay and SeaWorld Orlando (limited capacity, subject to availability) (Adult Passports Only)
* 50% off single day admission voucher for a guest with each Platinum Passport purchased (distributed at time of purchase, valid 90 days from date of Passport purchase)
* 20% discount on single-day admission tickets for friends and family
* Reserved seating at Moroccan Palace at Busch Gardens Tampa Bay (must arrive 15 minutes prior to show time, reserved seating is limited)
* Reserved seating at all shows at SeaWorld Orlando (must arrive 15 minutes prior to show time, reserved seating is limited)
* Free Skytower rides at SeaWorld Orlando
* Ride Again privileges on Montu, Kumba and Gwazi at Busch Gardens Tampa Bay
* Ride Again privileges at Wild Arctic, Kraken and Journey to Atlantis at SeaWorld Orlando
* Platinum Passport Member exclusive events and offers at Busch Gardens Tampa Bay and SeaWorld Orlando. Some special events not included.
* Platinum Passport and benefits not available at Discovery Cove. Limited quantities available. Benefit package subject to availability, change or cancellation.
It says it is $294.95 for Adults, and $284.95 for both Kids and Seniors.
It lists that you are able to use EZ Pay for payments on them too.
Here's also a link to that part of the site.
http://commerce.4adventure.com/store/dept_tickets.asp?dept_id=203#TC_PP
The Platinum Passport looks to be the only annual pass that is good for multiple AB parks outside of the state of Florida, and none of the passports include admission to Discovery Cove.
