Great choice
you wont regret it yo! hehe but yeah don't worry there are thrill rides too so yeah everyone will be happy. When you are in disney sea don't forget to have the "Sailing away buffet" its near the big ship. It has the best desert and is modestly priced.
Also don't miss the fireworks! Super mega sugoi, but I'm not sure if they changed the fireworks show to something new since I've been.