Just walk arround close to the port and in the oldest part of the village... Which is not very known but really cool one.

Have been to Cambrills a few times when staying in Salou, it is a lovely resort not as busy as Salou but nice beach, marina shops and restaurants. Just a few minutes from Salou by bus which runs regularly and also little train which has stops all the way. We actually walked from Salou the last time with the intention of jumping on bus or train when we got too hot/tired but made it all the way on foot with a couple of drink stops.

There is a market there one day but can't remember which day. Well worth a visit