Let's see, little things...I'd say:
Tint
Floor mats and a mat for the frunk
Screens for the roof and rear window (even with tint definitely without)
A second key card if you don't get both with it
If yours has the aero wheels and taking the covers off, center caps or lug nut covers
Some trays in the console are nice, several options there.
If you don't have a flash drive or ssd that works for sentry...something there.
A wireless charging matt, if that matters to you Jeda or another (or the Tesla one if you can find it...discontinued)
Those are all small items. On top of that I have become a big fan of ceramic coating making cleaning much easier. But, if you are street parking, you may also be having to use automated washes and/or cleaning places. Depending on the chemicals they use it might not be worth the effort to do ceramic coating, as it could degrade it faster.
Oh....one other thing: Be prepared for smiles. It is fun to drive.