Well, it would be a real shame to miss the Shamu show. Kind of like going to Disney World and not meeting Mickey Mouse!!
I think that your five year old, especially, will love Pets Ahoy. I would be sure to catch that show too.
Sea Lion High is fantastic, as is Blue Horizons (dolphin show).
Plan for some time in Shamu's Happy Harbour. Kid sized rides and play areas, all designed with the youngest guests in mind.
Budget and set aside time for animal feeding. Its a cool experience to feed a sting ray, a sea lion, etc....your five year old will be enthralled!
Shark Encounter is worth a visit. You walk through a tunnel and the sharks are all above you.
Turtle Trek, the Sky Tower (assuming its reopened by then....it had some technical difficulties last month and has been closed since) and Antarctica: Empire of the Penguin are all rides you can do together. Antarctica, in particular, has a penguin viewing area following the ride that is so cool! (literally and figuratively)