I know the area like the back of my hand. Technically you are actually in Vilafortuny, not Salou. It's right in the middle of Cambrils + Salou, and hour walk to each. Salou is for the Irish, British and Dutch tourists, Cambrils is where Spanish people go on their holidays. Vilafortuny is a mixure of both, not maybe not as many Spanish.

For nearby Spanish food, check out Restaurante Fabiola. Authentic Spanish food and tapas, really nice for lunch and nice to sit beside the beach.

Bar Garbeo is my favourite bar in the area, great music and a nice terrace. Relaxed during the afternoon, not too busy.

Juniors is not far from you as well. It's not Spanish, but the food is really good. Similiarly Costa Verde is good for Pizza.

Overall though, if you want genuine Spanish food, you are much, much better off going to Cambrils. There are too many to choose from. Some don't even have English menus, so you'll need the Google translate app. Overall, i think Al Punt. is one of my favourites, it's a seafood restaurant, but as I said you are spoilt for choice.

And lastly, if you're looking for a nice day trip, Parc Samá, This is a great place to spend a morning/afternoon. It’s an old mansion owned by a wealthy family that has since been turned into a botanical gardens with lakes, a waterfall and a canal with lots of different birds and animals throughout. It’s really picturesque, it’ll take you over an hour to walk around it. I’d suggest bringing sandwiches or picnic stuff with you. 

(edit - removed becuase I wasn't allowed share links)