Good question if only 3 nights / 4 days - why not use Shop N Drop to stock up what you need - Jeannie can get Serafina product - save the time driving for R&R
If you really want to visit Serafina and like shopping [not sarcasm, I like grocery stores!] then cabs will outweigh the car cost, though a cab is convenient if parking in Grand Case is going to be difficult
J&B