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This opera house hosts not only opera performances but also many concerts of the Orchestre Philharmonique de Nice and chamber music recitals, and some ballet performances. The house's website is in French only, but even if you don't read French well, you should be able to make out the information on their calendar (calendrier).
The castle hill overlooking the Baie des Anges and harbour offers a spectacular vantage point overlooking the city. Not much is left of its ruined castle besides crumbling walls. Still, climbing up the stairs to reach the platforms 90 m above Nice is well worth the view. There is also a lift (ascenseur) which will take you three quarters of the way up. The castle hill park closes at around sunset. Expect to be escorted outside if you stay longer.
2500 different plants in botanical garden and tropical glass house. Also various animals.
Indian, Chinese, Southeast Asian, and world art in great architecture on a lake.
Even if you are not in art, this is a museum which should not be missed. It includes stained glass windows by the artist.
Charming collection of paintings, drawings and sculptures in 17th-century Genoese villa.
The ruins of the Gallo-Roman settlement in Cimiez, plus a museum with nice documentation on Gallo-Roman life (but mostly not in English). Activities for children. Guided tours available.