1. Bromo Tengger Semeru National Park
Located in East Java, Bromo Tengger Semeru is easily one of Indonesia’s most scenic national parks. Spread across 800 square kilometres, the park is centred around a huge, ancient caldera filled with a sea of sand – the only one of its kind in Indonesia. From this lunar landscape rises majestic peaks, including the smouldering Mount Bromo at 2,329 metres and Mount Semeru, the highest mountain in Java at 3,676 metres. The most popular way to visit is a 4x4 tour, which takes you up to one of the viewpoints for sunrise before driving over the sand sea to Mount Bromo itself. Don’t forget to wrap up warm and wear protective footwear – it may be a tropical island, but it can get surprisingly chilly once you’re in the mountains.