Walk from Santa Margherita to Portofino (about an hour):

Hike to Castello Brown and continue on to Faro di Portofino light house:

Visit Museo del Parco, an outdoor museum overlooking the Portofino bay:

Spend a few hours at the beach; "on the rocks" like the locals, or rent a chair at one of the many beach clubs in the region:

Take a train to Cinque Terre and hike from Monterosso to Vernazza:

Rent a boat and scuba dive to see Christ of the Abyss in San Fruttuoso Bay: