Walawa National Park
Visitors to the park can see elephants, as there's a large population of them, along with crocodiles, water buffalo, and more. In fact, it's one of the best places in the world to see elephants in the wild outside of Africa. There are leopards there, too. There are also monkeys and a large assortment of deer and small mammals. It's also an excellent place for bird-watching. There are some small accommodations and guesthouses across from and even inside Walawe. You can also visit as a day trip.