It's worth visiting if you are heading Peniche. Try to go on a sunny day and take your runners to explore the island. Enjoy a beer and percebes with a view.
Truly paradise on earth. You get there with the half hour boat ride from Peniche and then take a few minutes to recover from the beauty of the place. There's a short hike around the island that's best done when sunny. You can also take a boat ride into the caves, which I'd very highly recommend. The boats usually have a transparent glass floor through which you can see the ocean bed directly. Every bit of this trip has an "Aaha!!" moment to impart. It's possible to stay back in the hostel in a really really old fort on the island. And you can also set up camp in the allocated sites. Do remember, this is a natural reserve, so you need to take back to the mainland any garbage you have. No trash bins on this island. :)
Beautiful nature but in general a big tourist trap. We didn’t have to much time to explore the island due to we took the 4h visit. In general very poor security on the boats. Staff on boats felt stressed and over worked, were told by staff they work 7days/week. The xtra boat trip to view caves felt kind of waste of money. We had amazing lunch with fresh fish, most expensive lunch bill during my two weeks in Portugal. Not my favorite.
Awesome trip to Berlenga. Better spent more and get there by SpeedBoat (25min) More fun, if are nice waves. There is many birds, and nice nature. It´s possilbe to swim also, but the water is a little bit cold. :)