LOL - this one is a fun one, and I may have posted this a while back, but we bring a TON of stuff on all our Timeshare stays - we drive so a small grocery box in the back isn't an issue. If we are flying somewhere we still try to bring as much of this as practical.
My suggestions:
One or two good kitchen knives (all timeshares have the cheapest Dollar Store sets)
A poly cutting board or two - Vistana and others have glass cutting boards - puts the teeth on edge
A couple of good non-stick frypans
Silicone spatula if you like them, tongs too
A BBQ tool and long handled basting brush (Vistana now provides a BBQ spatula)
Instant read thermometer, because I'm not familiar with the grills and no one wants food poisoning on vacay
A lighter - not needed
@vistana, they have gas grills, but other TSs have charcoal grills or fireplaces
A small salt and pepper grinder - sometimes they have little ones, but often just a few take out packets
A decent wine opener - there's always one there, always terrible. Of course you could just get screw tops.
Wine stopper - unless you ALWAYS empty the bottle (it IS vacation)
Our own detergent and dryer sheets - they are provided, but we do unscented
Dish drying mats - Vistana doesn't provide drain trays for hand wash dishes
Coffee beans, grinder & French press - because nothing says vacation like a REALLY good cup of coffee on the balcony
Some really basic spices, condiments, and olive oil - because you don't want to buy a whole one down there for just a week
A night light - makes me sound like a 4 year old, but put one in an unfamiliar bathroom if you make those late-night trips.
A small cooler bag to transport lunch and drinks down to the pool.
Zip lock bags or leftover containers. Helps if you are taking lunch to the pool, or the parks.
And finally, our own bedroom pillows. No matter how good the pillows are at a resort, your own pillow is sooo familiar
I know a few of these will seem weird to some, but perhaps it has also sparked some ideas for you as well.