The Sorrento tourist office is at Via L. de Maio 35, inside the Circolo dei Forestieri club, just down from Piazza S. Antonio.
Also handy—particulalrly for events—is the city's civic site, Comune.sorrento.na.it.
Visitor information for Italy
Tourist information, guidebooks, maps, tips for niche groups (students, LGBT, seniors, disabled, etc.), and more in Italy
inside the Circolo dei Forestieri club, just down from Piazza S. Antonio
“Because in the end, you won’t remember the time you spent working in the office or mowing your lawn. Climb that goddamn mountain.”
― Jack Kerouac