Hi Helena, there is a pretty easy road through the NP to a nice beach. You could walk there by yourself, but they don’t want you to visit the NP without a guide (who you have to pay of course, as well as the park fee). When we were there they did allow a couple to do it though, so you might get lucky. You can do morning, day or afternoon/evening walks. At dusk you have an almost 100% to see tarsiers, really cool creatures. Other then the guided walks in the park I don’t think there’s a lot to do, at least not without a tour. We walked to the village, which is pretty small and not much there. Not even a restaurant or a café to get a drink. Most people visit Tangkoko for max 2 nights. We did really like it there.