You have a lot of activities planned, especially if you don't plan on doing something every day.
I haven't been to DLR since I was 7 and I am 37 now, so I am not sure my advice will be helpful but here goes!
We have 8 days in California.
1 day at
Lego Land, which after reading here, sounds like that will be okay.
We have 3 DLR days.
We have 1 beach day/Aquarium of the Pacific
We have 3 days which can be part Disney, part beach days. We are thinking about visiting the tar pits.
I have tried to make this trip about more than just theme parks and incorporate a few local things as well. We went to WDW last summer and never left the property, except to fly out!
We are not visiting Sea World because we have that here in Texas. I think that a reasonable pace would be 2 days. You can do one, but you will not see it all. It is really a neat place but we skipped it since we have one closer to home.
The only thing that I think that I am sort of sad about missing is the San Diego Zoo. I just don't see how we could make that fit with our current plans.
We decided to skip Universal because it doesn't seem like there is a lot of stuff for the kids to do there. A lot of the rides seem to have scary themes. We had to eliminate something and this was the easiest for me to drop.
If I were you, I would prioritize what you want to do. What are the must-do activities? Then, let each member of the family have some input.
We made a list of our family's priorities and they were:
Me-Visit the beach- Our kids have never been in the ocean!

DS8-Visit Lego Land
DD5- Eat with Minnie Mouse
DH- Ride the big rides
Then we all got to pick a second thing. Pretty much after the second thing, we had the basics of our trip.
I hope that you have a great time! I am really looking forward to our trip!