The one rainy day in Nice called for a visit to the Musée d'art Moderne et d'art Contemporain. 

I wandered around listening to this which really elevated the whole gallery experience (particularly this song with the work by Juliao Sarmento). On the way back, to get out of a torrential downpour I ducked into an open pub and found an American ex-pat behind the bar who gave me all sorts of recommendations and info for day trips outside of Nice. He told me stories of how he met his Belgian wife and why he still hates the French even after living there for 10 years. It was an extremely informative unplanned happy hour.