^ you forgot Disney Hollywood STudios. (in total there are 4 disney parks and 2 disney water parks)
I just came back from Orlando Florida end of December for a 10 day trip. Spent Christmas there.
SeaWorld is a must..universal is just the same as the LA one, unless you're a huge Harry Potter fan, then there's the Wizarding World of Harry Potter in UNiversal.
If you're just going during the evening, the 2 disney parks I would suggest is Magic Kingdom (that's where Cinderella's castle is) and EPCOT. Epcot is a lot of fun.
Going in the evening, I think many of the animals and dolphin's etc would be sleeping or resting, so no there's really no point in going. If you want to just check things out, you can just head to Disney Downtown or Universal City Walk. These two would probably satisfy two of your evenings...
Anyways, enjoy FLORIDA! 'Cause i know i did