Numbers are thought to be stable and the rhinos are breeding, however they are an extremely rare sight and you are far more likely to come across banteng (wild cattle), wild pigs, otters, deer, squirrels, leaf monkeys, gibbons and big monitor lizards. Leopards also live in the forest and crocodiles in the river estuaries. Green turtles nest in some of the bays and the birdlife is excellent.
The national park also includes the nearby island of Panaitan (where Captain James Cook anchored HMS Endeavour in 1771) and the smaller offshore islands of Peucang and Handeuleum. Much of the peninsula is dense lowland rainforest and a mixture of scrub, grassy plains, swamps, pandanus palms and long stretches of sandy beach on the west and south coasts.
Most people visit Ujung Kulon on a tour organized through an agency, but it's also possible to head to Tamanjaya village and access the park from there or to make arrangements directly through the park office, which will link you up with a boat operator.