Have a fantastic time!!!! We have never had the single rider lines at DLR take too long (unlike at WDW- especially RNRC). At some point, walk into Carsland from the back of Pacific Wharf-- the view is breathtaking. In fact-- do it once during the day and once at night! You also need to see Carsland at night in general! You definitely should ride RSR both during the day and at night too--- single rider usually is great for that ride. You will never be able to look at Test Track the same way again after RSR. RSR is far superior.
For some reason, the Churro's at DLR taste much better than the ones at WDW. They are a must for us (usually for breakfast).
Due to the amount of locals, the first couple of hours are wonderful with short lines at DLR- get there at opening.
Don't stress-- DLR is so much for flexible than WDW. It is very easy to go into the park without a plan and just go where the day takes you!
DLR still has the animation academy at CA- so if you liked it at WDW- then that may be a must do.
Do you have hoppers? It is so easy to hop at DLR-- it is like one big park by WDW standards.
I don't know where you are staying, but the Grand Californian and
Disneyland Hotel are just a short walk from the parks and it might be fun to check those out to compare them to the WDW resorts. Really, to us, GC is just a scaled down version of WL. At DLH, you can stop by the original Trader Sams.
Will you have time to catch World of Color? WDW doesn't have anything like it. We really enjoy it.
Have fun!!!