Timor-Leste has some excellent opportunities for diving and snorkelling, particularly east of Dili, off Ataúro and around Jaco Island. Diving conditions are best during the dry season. In addition, there's lots of hiking opportunities, from a watch-the-sunrise hike up Mt Ramelau to more serious climbs up Mt Matebian.
Dugongs of Timor-Leste
Each day at Tasi Tolu, just west of Dili’s airport, Douglas the dugong has his (or her; there are rumours) lunch in the sea grass. Sightings of Douglas (and other dugongs) are never guaranteed, but these huge placid beasts are often spotted by divers and snorkellers at various sites along the coast east of Dili. Local dive operators can show you where to point your GoPro.