Not sure how old your kids are and what days you are going but you could consider just hitting CA adventure the 2nd day and being there 30-45 minutes before the 10:00 opening. We usually go into DL for a couple hours before hopping over but if you don't want to get up early, this is a good back-up plan.
Personally, I would forgo my shower and coffee to be at the parks at opening because you can ride SOOOO much in those first couple of hours (but I'm also going with very young kids who don't have the patience to stand in line and want to ride all the rides that don't have a FP). We usually end up having a super long day the first day because we want to get so much in and then the 2nd day we still go early but we take an afternoon break to catch some rest!
Have fun!
Alison