This walk would not be enjoyable if you chose the wrong day, but on a warm sunny day with clear views, and only light wind, it is a real pleasure and very easy. So check the weather forecast before you go. I did it as a linear walk from the Roque de Mal Abrigo to the Mirador Chipique. However, I am not going to write about that as the middle bit was certainly not easy. I am just going to write about the first 2.5 km, and suggest doing it as a there and back walk.
The Roque de Mal Abrigo (which literally means Bad Overcoat Rock) is at about km 34.8 on the TF-24 road which runs from La Esperanza to El Portillo. It is in the Teide National Park, which encompasses this strip of ridge as well as its main area in the caldera. You will find there are several places you can park off the road near to the start of the path.
The path goes towards the east, passing between bushes of Retama del Teide (Spartocytisus supranubius), Shrubby Scabious (Pterocephalus lasiospermus) and Tenerife Flixweed (Descourainia bourgaeana). There is a fork in the path early on, with signposts, take the right fork which continues roughly level, not downhill. There are fine views to Teide, and down the Orotava valley, and even the island of La Palma, clouds permitting.
The path climbs gently over a red-coloured gravelly rise, Montaña Yegua Blanca, and then descends the other side to meet the road. You will have walked 1.29 km and climbed gently about 60m. If you want you can retrace your steps from here, or arrange a car to pick you up. Otherwise you can go across the road and continue for a further 1.2 km with a short climb of about 30m before returning. This will get you to the top of Montaña la Negrita to enjoy the fine views down the ridge, and down to the coast of the Güimar valley and across to the island of Gran Canaria if it is not blocked by cloud or haze.
The path does continue on down from the top of Montaña la Negrita and is well defined and easily negotiated by adventurous and well-equipped walkers. It is, however, a steep descent requiring excellent footwear, surefootedness and, preferably, two sticks to negotiate safely. There is then a rise to Montaña Colorado followed by an equally steep, though longer, descent to the road at La Crucita (around km 30). I am therefore not recommending it as an easy walk!
The recommended walk to the top of Montaña la Negrita and back is just over 5 km / 3.25 miles, with around 100 m / 325 ft of ascent and descent. It took my friends and I 1 hr and 40 minutes to do it.