Neither a Sacramento resident nor an X75D owner but I'll toss in a few general thoughts from various trips from the SF Bay Area:
From Sacramento you've basically got two routes going south, I-5 and CA-99. I-5 has more alternatives and capacity in general, so I'd gravitate towards that. If you look on supercharge.info or Tesla's "find us" map, you'll see there are more Superchargers than you'll actually need, so you have some flexibility to accomodate the needs of your younger passengers.
Don't restrict yourself to what the car's navigation tells you. I almost never use the trip planner feature. Instead I'll pick out the route myself (including the sequence of chargers I want to use) and just use the in-car navigation to get to the "next" charger. Admittedly this is a holdover from the days before the trip planner feature existed, or it when it was just released and made truly horrible choices in routing. I presume it's gotten better since then.
If you want to mock this up, there are a few Web sites (such as A Better Route Planner) or apps (such as EV Trip Optimizer) that can help you play with different sets of chargers to see how the timing works out. Don't use the "trip planner" on the Tesla Web site...it's more of a marketing tool than a real estimator (it probably won't do the right computations for your car anyway).
Remember when you're Supercharging on a road trip, you don't need to "fill up" at every stop. Just give your self enough energy to make your next planned Supercharger plus a bit of margin. Unlike an ICE car, you'll probably want to run on the "bottom" part of the battery, because charging gets slower (and less efficient) as the battery fills up.
I haven't done any road trips under pandemic conditions, so I'm not sure I could comment about amenities at specific sites now. (Pre-pandemic, my usual stops on a north->south trip on I-5 were something like Gustine, Harris Ranch or Kettleman City, Tejon Ranch. Services and amenities were pretty good in those places.) Maybe someone else who's done this lately can chime in.
Bruce.