Two possibilities here, you go around the two caves and inside the deep forest which would take between 30min and 1h30 (depending on how amazed you are by your surrounding). The second choice is a trekking of around 3h (1.5km long) which will bring you to the caves with the prehistoric painting (which you can't see without taking this path). Note that you need to be there quite early to be able to do the trekking.