Wilmington, Del., isn’t likely to be mistaken for San Francisco anytime soon, but its new trolley cars, which connect key points in the center city, might be. Three trolleys, modeled on those plying the hills of the City by the Bay, went into service last week. For just a quarter, you can hop on and off at the Amtrak station, five major downtown hotels and a dozen of the city’s top attractions, including the Riverfront Market, the Grand Opera House and the Riverfront Arts Center - [302] 652-4088, or online www.visitwilmingtonde.com.