Trail markers are everywhere. You still need to carry a map book with you, but for the most part the trail is very, very well marked. In fact, it is so well marked that when you go awhile without seeing a marker you will start to worry and wonder if you missed something. Having said that, though, you will find occasional long(ish) stretches where there are no markers and sometimes you will agree that there was no need for them, and other times you will wonder why in the world no one put one up anywhere. It all depends how adventurous you feel at that moment.
The markers come in an infinite variety and these are examples of what you will look for, (hopefully) see, and will use to get you from temple to temple and around the island.
(Click to enlarge)