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Yelp
This beautiful abbey is well worth your time, but access is not simple. Research it.
At any rate, it was a nice stop along a 17 mile trek from Portofino to Camogli. That too is a recommended countryside adventure as you wind your way through various parks, small farms, olive orchards and citrus groves. In the summer months, you'll want to enjoy the water and pleasing vibes cast by the architecture.
Should you continue and not make this your midway point back to Portofino, your next major point of population will be the waterside community of Camogli. The bold jaunt is well worth it, but ensure part of your itinerary includes definitive train plans back to Santa Margherita Ligure. From there to complete your uneven loop to Portofino, you can always follow the road along the coast and add another 3 miles to your well-worked feet.