I’d get at least one person a preferred or higher AP for the free parking in the garages. Plus, the preferred gets 10 percent off most food and merchandise. And I’d keep track of when the parks open for the day, and try to be there before that opening time. Almost at any time of year, the first hour of open is the least crowded. And see when the hotels have early entry, then go to the other park, or know there will be those who go to early entry mostly in the Potter area.
And give yourself time to park, take the moving walking paths to through security and then from exit into City Walk head left to go to Islands, right to go to the Studios.
If you don’t want to spring for express passes, checkout booking a throw away room at one of the three hotels that include the unlimited express pass for all those in the room. They sometimes offer AP rates, so another reason to have at least one person with an AP. To check for that date, see the AP rate stickie in the Universal Hotel forum. The hotel’s card keys are your express passes and good the day you check in through the day you checkout. So 2 days of unlimited express for a one night stay, even if you never set foot in the room that you booked for the night. Or if all have the premiere pass, with that pass, you get a one per ride express after 4pm and 15 percent off food and merchandise.
Many do stay offsite, so you are not they only ones.
Can also use the single rider lines, where available, to cut down on line wait times.
Enjoy, as no matter where you stay, the parks are fun to visit.