This is possibly the worst area on Tenerife for buses. Services are infrequent and travel to every little hamlet in the hills en route so journeys take an inordinate amount of time.
Anyone based on the west coast who wants to explore the island would be well advised to hire a car or risk spending much of their holiday sitting on a bus.
Los Gigantes is in Tenerife. For general advice on getting around Tenerife, see my How to get around Tenerife page.