When visiting madeira, walking the levadas is one of the attractions one should not miss.
The levada das 25 fontes is a bit special, as it leads to a small river and a pons, with waterfalls.
We parked or rental car at the parking place, outside of the natural parked, and hiked about 30 minutes to the start of the levada. The road seems perfectly OK for cars, but it still was closed. So when you go there, add 2 kilometer both ways to the expected walk (and time). The advantage is that your adventre and the car-free walk starts earlier and lasts longer.
The path never becomes wide, and the steep a areas are fenced off. This felt like one of the safest levadas we walked. There are however some stairs to be climbed and on some places the roots of the trees can be forcing you to be very careful.
The small pond, and the fountains that await you at the end, make this a very nice destination.
On our way back, a cold and dense fog set in, making the drive or if the mountains quiet more challenging than anticipated.