There’s bolted slab routes on the granite below the castle by Sintra town. They look good and the views from them must be amazing. We tried to drive there one day to climb but got stuck in a nightmare one way system hell and ran short of time and then realised we’d forgotten the rope so gave up…
There’s also a small seaside sport crag just on the edge of Cascais. Notice board on the way down to it will all the routes and names/grades painted at base of routes. Was pleasant place to climb with the kids, bolting on all routes we did was good. Grades from 3 to high 7’s
We were staying in a large villa (8 people) in Colares which was lovely but not cheap. Could walk (down lots of steps) to Praia Grande (popular surf beach, with surf schools/board hire. Excellent restaurant right at the end of the access road). Seemed to catch a morning sea mist here, which wasn’t present further down and round at Cascais. Cascais area seemed very developed and touristy, Colares area less so.