Check out Yala National Park in the Hambantota District, Sri Lanka's most well-known wildlife reserve, for a chance to see the elephants, peacocks, Sri Lankan Leopards and a plethora of other wildlife. From Colombo, the park is about a 6 or 7-hour drive, so arrange to stay overnight in the region for at least one night. You can book yourself into accommodation in nearby towns such as Tissamaharama, which is also where many of the tours into the park start. If you are looking for air taxi Sri Lanka services to use for this purpose, check out companies like Cinnamon Air and similar services.