The journey to the islands takes about 2 hour on a good day by speedboat, and the best time of the year to make the trip is between May and October. During monsoon season (November to April) the time taken may be very much longer and the journey uncomfortable, although there may be storms in any month of the year.
Keep your eyes open, and you may see a frigate bird soaring high overhead, flicking its scissor-like tail as it changes direction with hardly a flap of its wing. You will almost certainly spot flying fish making their long low glides above the sea’s surface. Some of them “fly” for ten metres and are airborne for several seconds. Approaching the Archipelago, group of dolphins often come to greet the boat and play alongside it or in front of the prow. You may also be lucky enough to see a White-Bellied Sea Eagle as you approach the islands. It has a slow, gliding flight with the wings held in a shallow “v” as it soars, searching for sea-snakes, fish and crabs swimming near the surface. As you near the archipelago, the triangular silhouette of Rakata looms ahead. The island takes its name from Krakatau’s largest volcano, of which it is the remaining half. Cloud often covers the peak down to about 550 m, and above this height the forest begins to take on a different character. Mosses festoon the branches of trees, which are stunted at the peak. To the south (near the left side of the island as you approach) is a bay in which a settler named Handl lived with his family for a few years from about 1915. There have been no other permanent inhabitants on the island since 1883, although fishingboats visit the archipelago reguraly, the water within the island group often being calmer than the open sea.
Panjang, formerly called Lang Island, and sometimes known as Rakata Kecil was never part of Krakatau, but was once a part of Krakatau’s huge predecessor, “Ancient Krakatau”. Like Rakata and Sertung, it was covered in tens of metres of hot ash in August 1883, and this has been eroded over the past century into v – shaped gulleys separated by sharp ridges. Like the other two islands, it is now covered in forest. Some of the valleys are now ‘hanging’, because the ash cliff has been cut back by the action of the sea so that the valley floor now open at a considerable height above the shore. To your right, on the south western point at Panjang, the lava rocks of “ Ancient Krakatau can be seen near the base cliff.
Now to your left as you round its northern point, Rakata’s huge vertical cliff tower above you. Again, towards its base, the layers of Ancient Krakatau’s lava rocks may be seen, with ash layers between them, evidence of successive eruptions centuries ago. Casuarinas (cemara) cling to the cliff. They cannot tolerate shade, and on most other parts of the island they have , been overgrown and thus eliminated by other forest trees. Landslides are frequent on this cliff, and the prominent groove down the cliff face is not the former vent of the volcano, but a landslide Channel from close to the summit, pile of rubble, the result of landslide, can be seen at the base of the cliff. At the far end of the cliff are the black rocks of Zwarte Hoek, where there is a small beach.
As the boat moves under the cliff, remember that you are traveling over the submerged caldera of Krakatau. The cliff continues almost vertically under the water below you to a depth of about 200 metres. To your right, if the is calm you may be able to see Bootsmanrots behind you. These rocks often with seabirds usually terns roosting on them are a favourite spot for shark fishermen, and shark’s fin can occasionally be seen cutting the water over the caldera. The rocks are Krakatau’s caldera rim which projects above the water at this point. Apart from Rakata itself, they are only other piece of Krakatau visible above water today. Of course, no one could have been in this place before August 1883. Your boat is travelling along a line which at the time would have been covered by thousands of tons of the island Krakatau, which extended far to the north beyond the island Anak Krakatau to you right.
Moving past Zwarte Hoek and heading towards Sertung, you will notice, beyond the point to your left, a long sandy beach where the green turtle (Chelone mydas) nests, and just out to the sea two large isolated ‘stacks’. One of which has been perforated by the sea. These light-coloured cliff stacks, and cliff along turtle beach are composed of ash deposited in the 1883 eruption of Krakatau, and give you an idea of the depth of ash that covered the island at the time. The stacks have been able to persist because they are on a basement of lava which has prevented the sea washing them away.
Ahead is Sertung, the third member of the trio of islands that remnants of the huge Ancient Krakatau volcano. Sertung was enlarged by Krakatau’s 1883 eruption to more than twice its size. And is now virtually composed of ash from that eruption.
Start point from easthern side of Anak Krakatau Beach, the hiking path lead you through Casuarinas (Pine tree) which dominant in this island and tropical plants. The higher you climb, you will see an amazing view surrounding island. You could see some molten of rocks which expelled on September 2012 eruption, and you will just climb till summit out of crater. There is no path anymore to summit crater after massive eruption in 2012.