If you don’t want the sound of running water, place the pump discharge right below the water surface to generate movement. If the pond is large enough, add a few goldfish, which will eagerly devour mosquitoes and their larvae.
Attracting dragonflies can be great for your pond, dragonflies are valuable predators that eat mosquitoes, and other small insects like flies, bees, ants, wasps.
If you have a pond that does not have any fish, consider tadpoles, tadpoles not only eat mosquito larvae, they also grow up to become frogs, which will eat mosquitoes. Frogs can consume about a hundred mosquitoes a night.