Hiking to the San Ramon Waterfall, Ometepe Island
I think it's 3-4 kilometers from the road. The trip starts off easily, gradually going uphill. After reaching the small power station, it gets steeper. Part of the time you walk beside a stream and, if you turn around and look back, there are some gorgeous views. Eventually, the trail gets very steep and you have no choice but to walk beside and in the stream.