Font Lluminosa is Salou at its most resort-like, and that is not a criticism. The fountain sits on Passeig Jaume I near the beach, where families drift after dinner and the promenade becomes the town's evening stage. Its jets, lights, and music are deliberately theatrical.
It is a simple pleasure rather than a cultural monument, but it belongs on a Salou itinerary because it captures the rhythm of the place. Check the seasonal schedule before planning around it, then combine the show with a walk along the seafront or a late drink nearby.