Help needed 4-5 hours in Nice. What to see?

Will be anchoring in Nice on a cruise May 16. Would like to see Nice, Monaco or St. Paul de Vence? Whatare the chances? Is it easy with public transportation? How to start? What about taxi costs? To much for so little time. But open to suggestions/ideas to lessen load. Thanks

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You could see round Nice easily - by walking or using local buses and trams or alternatively by using the hop on hop off bus

With only 4-5 hours in port you would spend at least 2/2.5 of that travelling if you went to Monaco or st paul de vence by public transport

A taxi would save some journey time but be expensive