Off a vacant stretch of highway in Daytona Beach, Fla., a line began to form outside the sales center for the first Latitude Margaritaville “55 and better” community. Those waiting dragged folding chairs, coolers, tents and dog-eared brochures featuring numbered sites that, in just over 24 hours, they could stake a claim to for a $10,000 deposit. The mood, shortly after 8 a.m. one Sunday last November, was festive, ecstatic even. Drinks flowed, pizza appeared, a steel-drum band played into the balmy night. Some neighbors in the 300-person queue liked each other so much that they decided to become actual neighbors, switching their site choices to live closer together. A sense of destiny seemed to guide many of their decisions. Karen Goodwin, 55, a homemaker, had won the exact amount of the down payment a few weeks earlier in a Domino’s sweepstakes. Matt Kelly, 62, a retired firefighter, had been chipping ice off his shingles in Orange County, N.Y., when a chunk broke loose in the shape of the Sunshine State, which he took as a sign.