In Venice, the shortest distance between two points is rarely a straight line. Streets will unexpectedly come to a dead end or splinter off into two or more unmarked roads. My best advice: Don’t sweat it. While you pause and get your bearings, use it as an opportunity to check out a cafe, a wine bar, or—best of all—a gelato stand. With four days, you’ll have plenty of time to see all the major attractions (including Piazza San Marco and the Doge’s Palace), tour the nearby islands (especially Burano and Murano), and take in any scenic detours.