After more research and thinking, I booked Royal Pacific for the first 3 nights, then Cabana Bay for the rest.
I think it will be super nice to have the Express Passes for our first four days. Probably after that, we won't need to go in to the parks much at all. It's a bit of a splurge, but we are really looking forward to it and my husband especially
deserves it after working in our living room for a solid year (and no end in sight.)
Thanks for the help everyone!