Sure, vacations can be hazardous to your health: Beachgoers get sunburned, campers get poison ivy, air travelers get headaches. But stay home, as record numbers may be doing this summer, and your health could suffer much more. "Vacation deprivation," as it has been dubbed by Expedia.com, has been spreading for years as Americans' vacations get shorter or are skipped entirely. But this year's high travel costs, flying hassles and spooky economy may be creating a "perfect storm" that keeps people hunkered down as never before, says Geoffrey Godbey, professor emeritus in the Department of Recreation, Park and Tourism Management at Pennsylvania State University.