Provincetown (or P-town as it's known locally), Massachusetts, exudes an artists-colony atmosphere. It's also hospitable to gays and lesbians, who began gravitating there in the 1920s. In summer, the town is jammed with people sunning, partying and shopping (a lot of it trendy and pricey). The Provincetown Art Association and Museum showcases the work of some of New England's foremost artists. The Expedition Whydah Sea Lab & Learning Center is a literal treasure trove: The sunken booty of the pi...