The walking 'season' in Tenerife is normally October to April as the summer months can get very hot. I will consider putting on walks during the summer season but there will need to be at least two walkers in your party, it is unlikely that there will be a walk already subscribed to by other walkers that you will be able to join during this period.
 
Click on the walk names for photos

Walk 1: Roque del Conde. Impressive table-top mountain near the southern resorts of PDLA and Los Cristianos. A rocky mountain climb up and back down the same path to the summit. Fabulous views of the coast and inland to the mountains. Distance: 5 miles Ascent/Descent: 1500ft, Duration 4hours. 

Walk 2: Arona to Adeje. Full day mountain walk in impressively varied scenery in the south of the island between the towns of Arona & Adeje. Rocky mountain ascents, country lanes, pine forests, long rocky mountain descent. Distance: 12 miles, Ascent 2,000/Descent 2,800ft Duration: 6hours. 

Walk 3:Arona Circular. Shorter, circular version of the Arona to Adeje walk, superb mountain scenery in the Arona/Ifonche region. Rocky mountain ascent, barrancos (ravines), rural scenery, steady descent on hill path. Distance: 7 miles, Ascent/Descent 1,500ft,  Duration: 3.5 hours.

Walk 4:Lunar Landscape. Hike from Spains highest village to one of the islands landscape highlights. Initial steep ascent, mountain views, barrancos, pine forests, Lunar Landscape. Distance: 8 miles, Ascent: 2000ft/Descent: 2000ft, Duration 5hours. Date: 2nd Sunday of every month.

Walk 5:Coastal Walk. from Los Cristianos to Las Galletas in surprisingly remote coastal region. Ascent onto clifftops, tricky descent on rocky path to coastal path at Palm-Mar followed by longish, level trek through volcanic landscape to fishing port of Las Galletas. Good views inland to mountains. Can be hot, no shade. Distance: 9 miles, Ascent /Descent 500ft, Duration 4.5hours. 

WTS6: Ifonche.  Remote walk in the hills of the beautiful region of Ifonche. Initial steep ascent, then wide forest tracks through farmland. Picturesque route through pine forests on European GR131 long distance route, excellent views into Barranco de las Goteras & Barranco del Rey. Return via quiet country roads and tracks with superb views of the southern mountains.  Distance: 7 miles, Ascent 1500ft /Descent 2,500ft,  Duration 4.5hours. 

Walk 7:Vilaflor Circular  Circular route from Spains highest village through one of the wine regions of Tenerife. Attractive hike through pine forests and barrancos,  long ascent into remote hills on the European GR131 long distance route. Distance: 8 miles, Ascent 1800ft /Descent 1800ft, Duration 4 hours.

The Crater to Coast walk is a three day hike from the Las Canadas National Park to Costa Del Silencio. The following three walks combine to make up this excellent three day walk.

Walk 8:Las Canadas to Vilaflor A beautiful hike from the Las Canadas National Park down to Vilaflor. The route begins at the parador in the national park and climbs out of the caldera. Once on the rim, fantastics views are gained of Teide and the Las Canadas national park. The rest of the route is mostly downhill through barrancos and pine forests to Vilaflor, Spains highest village. Distance: 8miles, Ascent: 1,000ft /Descent 3,300ft, Duration: 5 Hours. 

Walk 9: Vilaflor to Mirador la Centinela  Linear route from Vilaflor, Spains highest village down to the spectacular Mirador La Centinela restaurant/viewpoint. Virtually all downhill through pine forests, along country lanes and paths. Two short ascents from Tamaide to the finish are the only uphill sections. Views of the high mountains and spectacular, expanding views of the south coast. Distance: 8miles, Ascent 400ft /Descent 3,300ft, Duration 3.5hours. 

Walk 10: Mirador La Centinela to Costa Del Silencio. Final section of the Crater to Coast Walk starting from the spectacular Mirador La Centinela starts by following the old camino towards Aldea Blanca. After passing under the TF1 motorway, the coastal plain is crossed before we reach the coastal path. This is then  followed to Montana Amarilla, which we climb for excellent views along the coast to Los Abrigos and Punta De Rasca. Distance: 7miles, Ascent 330ft/2,100ft, Duration 4 Hours.