This home is truly as lovely as others have said. Since they've already said that, I'll fill in some details about questions we had prior to leaving home.
We had 14 in our family, six school-age kids, eight adults. We followed Matt's suggestion that we ask The Market Place grocery store (like an old-time IGA and 45 minutes away) to pre-stock a few days of food for us. The online process is very simple. The store concierge will call you with any questions she has about your order. In the comment section, you can request things you don't see on the website. They might have them. Pre-stocking the food was a huge help! We arrived hungry late in the day. Kids didn't want to travel one more minute. They needed to play/swim, not sit in restaurant chairs.
The house has a filled spice rack and has soap/tissue in all the bathrooms. Bring your own shampoo/conditioner. You may --may!-- also find some other helpful "left-behinds" like baggies, foil, cooking oil, sugar, laundry soap, and sunscreen/bug spray. We used up many of the odd ends of bug spray, then left one of our own.
For folks with food allergies/sensitivities: Market Place and Burrows (the tiny local grocery store) both carry gluten-free pasta. Neither has GF waffles or baked products. Neither had any nut butters besides peanut. Both had non-dairy "milks" (almond/soy).
The welcome materials say it's safe to drink the water if you're staying in a house on the municipal water line, but doesn't say if Sandy Hills is on the line. The blue pipes in the front yard indicate that it is on the municipal water line and the owner confirmed it for us. So we stopped cooking with bottled water and used the ice the freezer makes.
There are classic games (like bingo), cards, and a puzzle or two in the ottoman.
There are a few life jackets and some snorkel gear in the bin on the deck. More can be rented/purchased in town. Bring your water shoes. The local prices for those are very high.
Overall-Wonderful!