SeaWorld is my family's favorite Orlando park, so it's a must do for us on every trip. Also, if we are in Orlando for a full week, we usually do two days at SeaWorld taking advantage of the special offer (go to the customer service desk and get tickets for a second day within seven days for $15 pp). // For all the parks, though, Disney, Universal, and SeaWorld your best option economically if you like doing more than one day at a family of parks is to focus on a particular park family. Disney discounts really start on day 4 and more -- We these days usually just do one day at Disney. Sounds like you are doing lots of days at Disney, so if another day their sounds fun, that's the economical option for you on this trip as others have said. // Universal has attractive pricing after day 1 -- We like their parks, but can hit what we want to do in one day lol (many people like to do three days there) -- And SeaWorld again big discount for a second day // also attractive pricing for combo for the SeaWorld park family -- e.g. Do Discovery Cove and you can get Busch Gardens, Aquatica, and SeaWorld as pretty economical add ons -- could make a nice Orlando trip. And they offer combination pricing for more than one of their park too that saves some dollars if you are interested in more than one.
Our last vacation was a party at Disney (that was our only activity there), a one day park hopper at Universal, two days at SeaWorld, and two resort days lol -- so many ways to do Orlando.