BG has some awesome roller coasters, several carnival type rides that are fun and some good shows. The animal viewing is also very good. Here is a list of our favorites. My DD is 6 and isn't tall enough to ride all the coasters yet.
Shreikra - IMHO one of the best coasters in the Orlando/Tampa area
Montu - Another good coaster
Kontaga - Really good show. Our family likes better than Lion King at AK.
Scorpion – Smaller roller coaster than DD likes. Not tall enough for anything bigger.
Animal attractions – Underwater hippo viewing, Serengeti Plains, Myombe reserve
DD likes numerous smaller rides, playing in Dragonland and the “Dumphrey the dragon” show.
If you have never been to SW before, I would try to see most of the shows. This will take most of the day. Look at the Seaworld web page for a list of all the shows. A few other non-show things that are worth seeing.
Sharks underwater viewing
Feeding the Sea lions and Stingrays. The stingray feeding is one of our favorites.
Underwater dolphin viewing area. We normally don’t try to feed the dolphins at SW Orlando. It is very crowded.
Kraken – roller coaster
Journey to Atlantis – Water ride DD likes this one
Wild Artic – Neat viewing area after ride.
Have fun and enjoy!!