Ticket upgrade?

[newestkg06]

We already have tickets for Seaworld with free all day dining included. If Hollywood Studios cancels one or two of the shows we are wanting to go to (Indy and LMA), we may try to add an additional day at Seaworld instead and skip DHS altogether. Is it possible to add an additional day (like at Disney) and how much more would it be? Or would it be cost-prohibitive since we already have "discounted" tickets? Thanks for any advice!

 

[hydrotony]

The last I heard, add a second day when you are in Seaworld was only $10. It is even on their website.