Ok, I'm warning you this post will be pretty long.

. First, I have never been to Aquatica or Busch Gardens, so I can't offer opinion on those. For SeaWorld, I recommend staying at Best Western Lake Buena Vista. It has spacious rooms, with microwave and refrigerator, and also free parking.

. It is about 5 miles from SeaWorld and Aquatica, just hop on Route 4 and take the exit for Central Florida Pkwy/SeaWorld.
SeaWorld
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Coasters
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Manta- flying coaster, very smooth ride. I didn't ride, being a fraidy cat of coasters, but my roller coaster crazy sister said this is her favorite roller coaster. Nice queue line, with stingrays and fish to look at. If anyone doesn't want to ride, they can pass to time next door in the Manta Aquarium (other side of queue line). Would suggest going to this as soon as you get in, as lines can get long later. My sister was 7th in line, I believe, but maybe she didn't run fast enough.
Kraken-floor less coaster, a little more jerky. Big drop, not as bad lines as Manta.
Shamu Express-average kiddie coaster, cute cars (orcas)
Other Rides
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TurtleTrek-360 degree 3D feature; you are supposed to be following a baby turtle in his early life. It really isn't very 3D in my opinion; some parts made me upset. Eh.
Journey to Atlantis- didn't ride this because of scary theming inside. So I can't make an opinion.
Wild Arctic- Don't ride if you get motion sickness: is a motion simulator. You are on a plane touring the arctic, does get quite a bit jerky. You see beluga whales and polar bears after.
Swishy Fishies- teacup ride. But you wouldn't believe how small those teacups are! I suggest the adults wait this out.
Ocean Commotion- fun ride, not scary at all. You turn, twist, and spin.
Antarctica:Empire of the Penguin- Awesome ride, do not miss this. You turn, twist, and bounce, while following a young penguin in his adventures. Very fun, and you get to see the penguin exhibit after. Do know that it is pretty chilly in both the ride and exhibit. Also know that lines can get long; we waited about 40 minutes mid-day.
Sky Tower- we waited in line only to be told it was temporarily down when our turn came, so can't give an opinion.
Jazzy Jellies- Also was down when we went.
Sea Carousel- Average carousel with sea animals in place of horses.
Other Attractions
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Dolphin Cove- open pool with the dolphins in it. You are allowed to touch and pet them if they come within reach; I did!!!!

. You can also feed them fish, but that costs $7 a person. The dolphins do tend to hang out nearer the people with fish, but they are still cool and fun to see.
Stingray Lagoon- another open pool with stingrays. You can reach in and pet them, and they come in touching distance constantly.

.
Pacific Point Preserve- forgot to do this.
Pelican Preserve- also forgot to do this
Shark Encounter- Also forgot.....
Manta Aquarium- aquarium on other side of Manta queue line that I mentioned earlier. Awesome place to wait if you don't want to ride, and good even otherwise too.

. Stingrays, fish, starfish, coral, etc.
Jewel of the Sea Aquarium- yeah, we forgot this one, too......
you can also find flamingos pretty near the entrance inside the park,which are cool.
Shows
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One Ocean- AWESOME SHOW, featuring the orca whales. Arrive at least a half hour early to get decent seats. If you want to get wet, sit in the soak zone, as far forward as possible. We sat in row 7 of the soak zone, and didn't get wet at all.

. But very fun show anyway!!!
Blue Horizons- Very nice show featuring dolphins, acrobatics, dives, and tropical birds! Again, arrive at least a half hour early for decent seats. It's very cool when the birds fly into the stadium right over your heads, and dolphins and acrobatics are fun too.
We couldn't catch any other shows, though.
Also just wanted to add that all SeaWorld staff we talked to or asked a question of we're very helpful.

: Other than that, just have fun!!!!!

. SeaWorld is an awesome park! Enjoy, and I hope this helps!!!!!
