We loved our day at Seaworld. My daughters enjoyed seeing all the animals and patting a stingray! My youngest loved the monorail, both riding on it and standing underneath as it passed overhead! We didn't see any shows, but we did go on a helicopter ride, which was the highlight! The kids rides were great and they spent hours running to and fro as the lines weren't too long. There could be more seating available near the food outlets as this area was extremely crowded and it did take a long time to get our lunch. The refillable drink cup was excellent, both in terms of value and convenience. We only found the one place to fill it up though, so maybe add a couple more drink stations, or the ability to get it filled at food outlets.
My favourite by far on every visit is the polar bears. They weren't very active though, and there was only ever one on display at a time.
Also loved the shark tank and the penguins. Can't wait to visit again next time we're on the Gold Coast.