Half a day, get a local day return bus pass from and to Santa margarita, cheaper place and lots of good restaurants.
about 6 years ago
Portofino is very nice but very expensive. I recomand you to take boat from Rapallo, so you can se the riviera, and take half day for Portofino. On the Way back you can stop in Santa Marhgerita, and take local bus to Rapallo.
about 3 years ago
Simple and Flexible