The lower red dot on the right is when you are on the main street in Riomaggiore (Via Colombo) and walk all the way down to the Marina. When you reach the Marina (the water, the sea) keep right. You’ll recognize the little dam and the jump spot. On top of the spot is a lamp post. The dam in the map you also see in the movie. The higher red one on the left is visible from the train station. To get to the spot you first have to walk past the first location along side the sea. There is a path leading there. From the location, you
see the station (also visible in the film if you look closely).