Don't forget to bring your camera to capture the flowing cascades of Ventas Rumba. If it's raging, you may be able to feel the mist on your face.
You'll be spoiled for sightseeing choice when visiting Kuldīga. Ventas Rumba is a great place to begin here, but there are numerous other interesting attractions to experience. Venta Rapid, and The Riezupe Sand Caves are near the cascade of water and will fill in your day nicely.