Go someplace haunted. Every major city has a Ghost Tour anymore. Heck, Salem Massachusetts has three or four of 'em.
Visit someplace famous for being the siote of something creepy happening, or where a movie was filmed with something creepy in it. Here in New England we’ve got plenty of that — Besides Salem with its witches, there were witchcraft proceedings elsewhere in Massachusetts and in Connecticut. There’s America’s Stonehenge, which may have inspired H.P. Lovecraft’s “The Dunwitch Horror” (and there are other sites which S.T. Joshi thinks may be the inspiration in Connecticut and elsewhere). There’s the House of the Seven Gables, and places in Salem, Gloucester, and elsewhere that inspired Lovecraft’s “The Shadow over Innsmouth”. Go to Rhode Island and see the vampire graves that Bram Stoker saved clippings about for inspiration for Dracula. Go to Fall River and see Lizzie Borden’s House (or stay overnight – it’s a B&B). Other places around the cou ntry must surely have their own spookinesses.
Read Poe, Hawthorne, Lovecraft, King, and other frightmasters. Pick up The New Annotated Dracula.
Buy a book on Tarot and a pack of cards and tell each other’s fortunes. Play “War” with the deck and watch and see if something awful happens.
Watch a marathon of Frankenstein movies. Or Dracula movies. Or Nightmare on Elm Street movies. Or something.
Go to a Halloween party.