Cirebon is a city in West Java. It's located near border with Central Java. The city weather is hot and humid. Wear cotton clothes. You do not need long sleeves shirt, instead a T-shirt and knee-long trousers are comfortable. Some places like mosques (masjid) and temples require polite dress such as long trousers/skirts.
Some of the prominent landmarks include Kraton Kasepuhan, Kraton Kanoman, Gua Sunyaragi, and Grave of Sunan Gunungjati.