YIKES!
Perhaps we have different vacation "styles" but I personally would never schedule a vacation this way. As others have said, just way too much travel time and I prefer to do as little travel once I arrive at my destination as possible. I would much rather sip a cocktail poolside or eat at a yummy restaurant then be stuck in LA traffic!
I'm curious as to why you are splitting up your destination spots? Why not just do SeaWorld,
Legoland, etc and then head to Disney??
I wonder if maybe you haven't alloted enough time for Disney? It's going to be busy with Spring Break crowds so this will add to overall time frame.
And I just have to ask...why are you flying into LAX?? I've always found it to be one of the more expensive airports in SoCal to fly in and out of....typically Long Beach and Santa Ana/John Wayne are the cheapest and really only 30 mins (give or take traffic) to Disney.
I'm sorry to be so negative, don't mean it to sound that way...but IMO, there's just so many things I wouldn't do and I've been going to SoCal and Disney for well over 25 years.
Taking out the zoo was a good 1st step!

A zoo is a zoo, right? If you've been to the one in your area then you know what they are like.
I would fly in closer to San Diego, do SeaWorld and Legoland OR fly into Burbank and do Universal Studios (this is our 2nd choice for theme parks after Disney and well worth visiting!) then head to Disney and spend a couple days there and fly out of Long Beach or SantaAna. One thing to remember when driving in SoCal...it will probably always take you twice as long as you think it will.

So I avoid any "back and forth" driving at all costs! I do NOT want to spend my vacation in SoCal traffic!
The other thing I notice is that you've scheduled late nights and early mornings. This is another thing I try to avoid while on vacation. I would try and do a late night followed by sleeping in, swimming etc and then getting to the parks mid day- if you can. Or do an early morning but then come back to the hotel around dinner time to rest and regroup. Don't underestimate the power of the pool!
As I said earler, maybe we really do have different vacation "styles". My objective is to always see the parks and incorporate as MUCH rest and relaxation time as possible. Good luck to you...you'll have fun no matter what you choose to do!