D.P.
There are plenty of places to rent stuff for the beach, we have done this many times and was always a pos experience!
You can also rent linens (if not provided) and for a small fee, they will make up the beds before you arrive.
Bring clothes, swimsuits, sunscreen, sunglasses, toiletries, medications, etc.
Rent linens, crib, highchair, boogie boards, pack& play, sun cabana, beach chairs, umbrella for the week.
Buy floaties, goggles, etc there.
I love renting a house with washer & dryer b/c we come home with ALL clean laundry! No need to pitch.