Visit the Tourist Office in Playa de la Arena loads of leaflets for walks in the area and further afield in Tenerife. Don't know if it's still open but there was a bike hire place in Varadero that sold guide books for walking in Tenerife. Got a few of the books and done lots of the walks. Nice walk from Giua de Isora to Aripe and Chirche if the fires haven't wiped it out. Stunning walks along the coast at San Juan de Rambla through a cliff top hamlet called El Rosario, then further along the coast towards Puerto de la Cruz the Rambla de Castro.
Most do-able using the buses. Couple of days on the sun bed with a guide book and the Titsa timetable then off for an amble with a Bono, camera and a bottle of water. Wonderful life.