You'll need to call ahead to visit the world's largest Roman cistern, but it's well worth the effort to experience this underrated...
Museo Archeologico dei Campi Flegrei
One of Naples' lesser-known gems, the Archaeological Museum of the Campi Flegrei delivers local ancient treasures without the crowds....
Bar del Castello
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Lonely Planet review
Right on a sandy beach with views of Procida and Ischia, this retro, sun-bleached restaurant enjoys cult status in Naples (book ahead on weekends). The seafood dishes are simple, fresh and lingering, from the antipasto misto (which might include fried courgettes and prawns, marinated carpaccio and octopus salad) to an unforgettable spaghetti alle vongole (spaghetti with clams).
If the weather's on your side, request a table on the raffish deck (or right on the sand) and while away the hours with a local Falanghina.