As the islands are pretty cut off, it’s important to organise currency before you take the trip. Some hotels will accept credit cards but it’s not something to rely on.
Cover up. It’s important to show respect when visiting villages and you’ll see signs reminding you not to wander around in bikinis.
I read that Sunday is considered family day for a lot of people (for religious reasons) so avoid this for travelling or taking part in activities.
Remember, Raja Ampat isn’t a tourist destination like Bali, so expect the experience to be a little more rough and ready! It’s all part of the adventure…
Source : https://www.wanderlustchloe.com/raja-ampat-indonesia-travel-guide-tips/