Baia di Niasca is a chill beach spot near Portofino where you can soak up the sun, paddle board on the shimmering waters, and just relax. The beach is pretty small and if you are driving a car it will be extremely challenging to reach it as there are no parking spots for cars. There are just a handful of spots for motorbikes.
It can be reached by walking from Portofino, and if you are coming from Santa Margherita Ligure you'll find it on your path towards Portofino. I think it's the best option to reach this beach, but make sure to go in the morning, otherwise you won't find a spot.