We interrupt our regularly scheduled Boston coverage to bring you the following information: Uh, hello. It’s summer. Get out of the city and on to the beach already. Which means you’ll probably wind up on one of the two big islands. But which? And what the heck’s the difference between them, anyway? Before you book a ferry, here’s an update of the corresponding essentials at each: Celeb oglingNantucket: Ben Stiller, Jack Welch Vineyard: The Clintons, Ted Danson, Carly Simon Spending Nantucket: Gypsy, 47 Main Street, Nantucket Town (508-228-4404). Vineyard: Midnight Farm, 18 Water-Cromwell Lane, Vineyard Haven (508-693-1997). Proper dress Nantucket: Plaid (irony-free) Vineyard: Jane Fox florals Big-deal restaurantNantucket: Topper’s, The Wauwinet, 120 Wauwinet Road (508-228-0145). Vineyard: Atria, 137 Main Street, Edgartown (508-627-5850). Local sauceNantucket: Cisco Brewers, 5 Bartlett Farm Road (508-325-5929). Vineyard: Chicama Vineyards, Stoney Hill Road, West Tisbury (508-693-0309). Cult restaurant Nantucket: Black Eyed Susan’s, 10 India Street, Nantucket Town (508-325-0308). Vineyard: Lure, 31 Dunes Road , Edgartown (978-443-1733). Pickup sceneNantucket: The Gazebo, 1 Harbor Square, Nantucket Town (508-228-1266). Vineyard: South Beach, Atlantic Drive, Edgartown (508-693-0085). Lobster fix Nantucket: Straight Wharf Fish, 4 Harbor Square, Nantucket Town (508-228-1095). Vineyard: The Bite, 29 Basin Road, Menemsha (508-645-9239). Watering hole Nantucket: Brant Point Grill Bar, 50 Easton Street, Nantucket Town (508-228-2500). Vineyard: Offshore Ale, Kennebec Avenue, Oak Bluffs (508-693-2626).