The crater lake of Mount Rinjani in Lombok
Indonesia is home to no less than 167 active volcanoes, far more than any other country. Some of the more accessible for visitors are in the Bromo-Tengger-Semeru National Park and the Ijen Crater in East Java, Mount Rinjani in Lombok and perhaps easiest of all, Mount Batur in Bali.
Hardly surprisingly in the world's largest archipelago, beaches are significant attractions. Aside from the obvious like Bali, there are wonderful beaches in off-the-beaten-track locations in Maluku, Nusa Tenggara and Sulawesi. In a nation of 18,000+ islands, the options are almost endless.
An endemic Sumatran Orangutan in the Gunung Leuser National Park
Indonesia has some of the largest remaining tracts of tropical forest anywhere in the world, and these support an incredibly diverse wildlife from Orangutans and other primates to critically endangered Javan Rhinoceros and Tigers, and an extraordinarily wide range of bird species. Forest areas recognised as UNESCO World Heritage Sites are Ujung Kulon National Park in West Java, and three huge parks in Sumatra, which together comprise the Tropical Rain Forest Heritage of Sumatra: Bukit Barisan Selatan National Park, Gunung Leuser National Park and Kerinci Seblat National Park.
Further east, Komodo Island is the home of the remarkable Komodo Dragon and a very diverse marine life. Close to the very eastern limit of Indonesia, the remote Lorentz National Park in Papua has a permanent glacier, and is the single largest national park anywhere in Southeast Asia.
Historical and cultural attractions
Borobudur in Central Java is the world's largest Buddhist monument, dating from the 8th century, and nearby Prambanan is a remarkable Hindu monument dating from just a few years later. Those two, together with the charm of Yogyakarta, make for a popular cultural combination in Central Java.
Pura Ulun Danau Bratan in Bali
Also in Central Java, the Dieng Plateau is home to the oldest extant temples in Indonesia, predating Borobudur by some 100 years, and just north of Solo, the early man archaeological excavation at Sangiran is a UNESCO World Heritage Site.
In such a vast archipelago it is hardly surprising that there are some very distinct and unique cultures, often contained in relatively small areas. Bali has a unique Hindu culture, descended from the great Javanese Majapahit Kingdom in the 13th and 14th centuries. The whole island is adorned by beautifully kept temples (pura), and there is a seemingly endless procession of colourful ceremonies. Some of the better known are the mother temple at Besakih, Pura Ulun Danau Bratan, and Pura Uluwatu.
Further east, Sumba is home to one of the few remaining megalithic cultures anywhere on earth. In Sulawesi, the Tana Toraja region is famous for spectacular animist burial rites. Visiting the vast hinterland of Papua in the far east of the country requires considerable planning, an awful lot of money, and a tolerance for extremely challenging conditions. However, for those who want a true wilderness experience and the opportunity to witness first-hand cultures that have had very little contact with the outside world, it is hard to think of a better option anywhere on earth.
In popular travel destinations like Bali and Jakarta accommodation options run the gamut, from cheap backpacker guesthouses to some of the most opulent (and expensive) five-star hotels
and resorts imaginable.
Off the beaten track, though, your options will be more limited. Probably the most common lodging choice for backpackers is the losmen, or guesthouse, which also go by the names wisma or pondok. Often under US$15/night, basic losmen are fan-cooled and have shared bathroom facilities, usually meaning Asian-style squat toilets and mandi (water tank) baths, from which you ladle water over yourself (do not enter one!). Very small losmen, essentially homestays or rented rooms, are known as penginapan.
The next step up on the scale are cheap Chinese-run hotels, usually found even in the smallest towns and cities, typically near transport terminals. These may have little luxuries like air-conditioning and hot water, but tend to be rather depressing otherwise, with tiny, often windowless rooms.
By law, all hotels have to display a price list (daftar harga). You should never have to pay more than the list says, but discounts are often negotiable, especially in the off season, on weekdays, longer stays, etc.