I had a great 2 days 1 night stay in Tangkoko National Park and I saw two tarsius, many black monkeys, a hornbill family, spiders, frogs etc. There is also a wonderful beach with beautiful colors to relax after the walk. Iwan is a great guide who knows a lot about the animals and plants and adapt the tour to your special wishes. If you are patient enough, I am very sure that Iwan will always find the famous tarsius and hornbills, even though they are not easy to find. He has a good sense where they hide.