If you go on a day trip to Porto Santo you might be strapped for time, but see if you can make this hike fit in. It's 2.7 km each way (3.4 miles in total). If you walk in a steady pace you can do it in less than 2 hours. The views are amazing and you enter a small little fairytale world with epic bird life and even more epic views. This is a must do activity in our opinion.
Our video from here: https://youtu.be/wd38wOylI4o?t=78