Not many foreign tourists go to Peniche because it is mostly out of the way of basically everything. But if you have some spare time in portugal or you are a surfer (some times of the year the waves are great) Peniche is worth a visit.
For those in need of their seafood -fix : this is the place to be and since most restaurants serve mostly portuguese tourists you can still tast authentic meals here. Try Robalo (no forno) or one of the Bacalhau receipes! For all your other seafood cravings there is a wide variety of shellfish, mussels, crab, shrimp, lobster, ... .
A nice to know is that peniche used to be an island in the sea and the old city walls are still there, but that's as cultured as it gets.Hang out in lazy peniche where it never gets blistering hot, swim a bit and enjoy the food.