Well, it's whatever turns you on, really.
If you want a change from France and a sample of life in a nearby Italian town, you can't go far wrong with Sanremo. Don't expect spectacular beauty or the manicured opulence of some places on the Cote d'Azur (nor their high-rise developments), but it's a pleasant place.
A reasonable main shopping street and other interesting areas, a reasonable selection of restaurants and cafes, two small harbours, a rather small cathedral, many interesting architectural survivals (including the Casino) from its heyday many decades ago, a mediaeval old town with narrow pedestrian passages, beaches, markets etc.
Access by public transport: one suitable through train from Nice at 10.04 (reservation required) or by normal local trains changing at Ventimiglia.