Amalfi Coast: Strategies: When to Go
During the high season (June–August), the Amalfi Coast is hopelessly overrun by tourists, a situation made worse by the region’s tight and winding layout. Unless you’re approaching on a private yacht, your best bet is to avoid the area during this time. Late spring and the fall are better, though off-season you will encounter lots of school groups and large tour buses, which are banned during the summer. It’s a seaside resort setting, so most businesses, including restaurants, shutter during the winter. The unofficial time for reopening is Easter.
— Simone Girner 08/01/2008