We LOVED Seaworld. Of course I went with just me a DD4, so we didn't do the three "BIG" rides... (there are now four with Antartica being open)
Here's a sample plan:
9am 1 Manta
2 Atlantis
3 Antartica
4 Swishy Fishies
5 Sea Carosel
12:00 6 One Ocean
7 eat
8 Wild Artic
10 dolphin cover
3:30 11 Blue Horizons
12 Feed Stingray
4:30 13 Clyde and Seamore
14 Shark Encounter
15 kraken
Beaucse while Shamu's Happy Harbor is for kids, there are still height restrictions on most of the kid rides, so I only listed swishy fishies and the carosel. And I would have the two adults without a child to go grad seats for Shamu while yall take the baby on the two kiddie rides.
Also I didn't love Clyde and Seamore, but most people think its great. It's kind of slapstick humor, so that's up to you. Also, I used the limited weekday show schedule, so if you are going on a weekend you'll have lots more show time options and can add allure or something.