Each summer weekend can be like a holiday here in Maine. Once, to the Vikings, it was rugged Vineland; today Maine is Vacationland. After a hard, dirty winter, mild air and watery sunlit places are calling: an abundance of evocative coastal places within a couple minutes' or couple of hours' drive. The author experienced one beach not typical of Maine. It was different in a lively way. She and her spouse, Allen, drove to Auburn for groceries and suddenly decided--over lunch in the Nickel Diner--to go visit Old Orchard Beach before grocery shopping.Old Orchard Beach has long been a resort town, situated in a curve of Saco Bay and full of mechanized carnival life, its waterfront crammed with screaming or jovial activity, shimmering in sunlight. After a search in side streets full of summer lodgings and cars, the travelers locate a place to park, then walk down to the sea--down to "Maine on the Mediterranean."