Mondays-Thursdays prefered, avoid weekend.
Sea World is obious if you like thrill rides. Kraken/JTA first thing. They have manageable lines throughout the day and the lines generally move fast. So, there really is no gameplan here. Just watch show times you want to see and plan around them.
BGT: Gwazi can build a line, Montu and Scorpion can build small ones, and Kumba and Python have reletively no line. So, Gwazi first. Get your fill of this! The line may reach undesireable amounts during the day. Then over to Montu. If Rhino Rally is over 30 min. continue on. Ride Scorpion and anything in that plaza you are interested in. Then go to Kumba, followed by Python. By then, if not sooner, it should be time to eat. I suggest the BBQ in Stanleyville. We eat it everytime we go. Now, if you wish, ride Tidal Wave, flume, and CRRapids. At this point you pick throughout the remainder of the day a mixture of animals and coasters. The Nursery, Myombe Reserve, bird area, and Edge of Africa should be seen.