As you approach Principe's Ecological Zone, you will see O Que Pipi Waterfall plunge out of the jungle in the distance. To reach the pool, you will need to hike uphill for about an hour through dense jungle. It's not a difficult hike, but the trail can get dangerous slippery when wet, so wear sturdy footwear. As you finally get to the base, you will get soaked in the spray. As this is Principe, nobody knows the exact height, but about 30 m. The natural pool offers a refreshing dip before you head back the same way. Though locals will tell you different, you don't need a guide, but you do need a ride to the trail start. There are signs and even a rope for the tricky section. If going with a guide, you will also need to pay 5 euro per pax for the national park fee.