There is little of mention in Lamas but the view from the church, and the church itself, make the climb worthwhile.
The arrows at the end of Lamas are quite poor, and the old arrows can lead you on a needless hike to a washed-out bridge. After descending back to the level of the N1, turn right towards it. You will walk along it, sticking to the left-hand side, across the Rio Vouga.
On the far end of the bridge turn left into Lameiro.