If you can only go to one National Park in Sri Lanka, then choose this one over the more popular Yala National Park. The game viewing is better, more interesting, and more diverse. It's a smaller Park and, therefore, not travelling miles before seeing anything. There are also less visitors so you are not tavelling in a convey of dozens of vehicles all bunched together but have a more personal experience.
This review is the subjective opinion of a TravelPod member and not of TravelPod.com.