I second the tire pressure adjustment. Factory or port tends to fill it to max side wall which is a BAD practice.
Don't let them fill it with Jakes Cheep-o Pump and Run - go with the salesman for the fill up and dont tip-top it off in the hot weather - the evap canister doesn't like to be flooded.
Test drive again and Check alignment and tire balance at 40 50 and the max speed you will go on the HW. No use going back a week later. If your state has safety/emission inspection, make sure they performed it.
If it is a FORD or GM get it on a lift and make sure nothing is falling off or bolts missing. I have had a front light truck Cab not bolted on, transmission only held in by the starter bolts with fuel line laying on the bellhousing, clutch slave fail as the factory left a barcode label in the reservoir when they filled it, a major exhaust hanger bracket fall off, tire side walls split open from over inflation, tail light fall out on the first bump in the road. List goes on.
Check the finance paperwork if you took out a loan. Make sure you have the correct loss-payee address. It can be different from the Corp. office addr. Double check the VIN on the title app with the stamped number tag.
Enjoy. Remember that new car smell is a toxic outgassing of glue and plasticizers. Open those windows whenever possible and No AC recirc for a couple months.
Enjoy!
BTW what's the vehicle?