I visited this WHS in August 2018. Apart from the main complex of Prambanan, there are another 3 temples nearby which are worth visiting too, namely Candi Lumbung, Candi Bubrah and Candi Sewu. The latter of the three has very intricate carvings which hint at how extraordinary this temple must have been in its heyday before the several earthquakes that hit this region up until 2006 (with the Yogyakarta earthquake) and in 2014 (with the volcanic ash from Mt Berud volcanic eruptions).

The effects of these several disasters is clearly visible as most of the temples are in ruins but recent restoration works have helped at least conserve what is still standing. Nonetheless, Prambanan is the largest Hindu temple site in Indonesia and one of the biggest in South East Asia. In a way it is comparable to Ayutthaya in Thailand.

If you visit first thing in the morning, a long (half) day should suffice even though the Ramayana show and sunset views could add value. I opted to tick Sangiran WHS instead. To cover the 3 minor temples, it is a pleasant walk but if the heat is too much you can hire a golf cart or ride the hop on hop off tourist train too.