Do we need to bring laundry detergent? Anything else we should bring that are easily overlooked?
Each Samoset timeshare building has one coin operated (...bring quarters) washer / dryer room on the top floor in the center of the building. Laundry detergent in small packets available for purchase there, or bring your own. Samoset units are equipped like timeshare units anywhere (...but no oven compartment beneath the stovetop).
Grocery: we will be driving from Boston. Shall we pick up grocery before reaching Rockport, or is there a decent grocery store nearby?
We generally grocery shop at (Maine-based company) Hannaford in Camden, just off the southbound side of Route 1 in Camden, a few miles north of Rockport.
Will pass on the Acadia N.P. and restaurant questions, whose answers are matters of subjective personal opinion. Others may choose to offer opinions on those items.
Btw, there are several detailed, reasonably current (and IMnsHO very accurate) Samoset reviews on TUG, which may be worth reviewing before your upcoming travel.
P.S. Be reminded that there are pools both indoors
and outdoors at Samoset, so don't forget to pack bathing suits if you might possibly be using them.
One might otherwise easily overlook even
thinking about bathing suits in early June in mid-coast Maine.
Also, you will have (...free, by presenting your unit keycard) access to the on-site Health Club as a timeshare guest, so if anyone in your party is interested in "working out" there (or gaining access to the indoor pool or hot tub), consider packing some appropriate gym clothes and footwear too.
Samoset is neither primarily nor just a "golf resort", but there
is a championship 18 hole course on the property, to which timeshare guests have access, but no priority.
P.P.S. If you plan to walk out to the nearby Lighthouse via the granite breakwater protecting adjoining Rockland Harbor, be sure to bring (and wear) appropriate footgear.
The huge granite blocks which comprise the Rockland Harbor breakwater have irregular surfaces and many sizable gaps (and maybe some pockets of pooled water here and there too), so "flip flops", leather bottom sandals and other loose, slippery or otherwise flimsy footwear would be both unwise and unsafe if walking out on the breakwater.
Hope you enjoy your stay at Samoset --- it's a great property in a great area.