It's darned annoying - I saw the Masca TITSA bus stop, and assumed I could find out which number later
If no bus to Masca, then probably a lift to Masca, then a lift back from Santiago del Teide would work, because I KNOW the 325 goes from Los Gigantes to SdT. Less work for the drivers, and for those without transport, the 460 from SdT goes back towards civillisation via the TF82.
My daughter did the Adeje barrancho walk, and the Masca walk, and said the Masca walk is 100 times better.
@CFGirl: All downhill, with a boat ride at the end (and a swim in the bay, if you are able)