Some ideas for a week or more :

FRENCH RIVIERA & PROVENCE ITINERARIES
- Monaco / Nice / Antibes / Golf Juan / Cannes / St Tropez
- Cogolin / Port Grimaud / St Tropez / Toulon
- Porquerolles Islands
- Monaco / Cap d'Ail / Beaulieu / Villefranche / Nice

PROVENCE :

St Tropez
Toulon
Marseille

CORSICA :

Ajaccio
Bonifacio
Calvi

SARDINIA :

Porto Cervo
Porto Rotondo

ITALY :

Genoa
Portofino
San remo

SPAIN :

Barcelona
Palma
Menorca
Ibiza