If you are interested in volcanoes. A visit to La Palma to see the effects of the sept 2021 eruption, is a must-see. The western Islands had also Laurisilva ev

If you are interested in volcanoes. A visit to La Palma to see the effects of the sept 2021 eruption, is a must-see. The western Islands had also Laurisilva evergreen forests. An humid ecosystem relict as close as one "European rainforest" as you can have. Very "Jurassic Park" vibes (the native giant lizards prefer the rocky areas in any case). The small El Hierro Island is worldwide famous as diving spot. All Islands are good to dive, but in El Hierro is easier to spot big fishes. Whale sharks and Manta rays are not uncommon in the correct months. Very good places also to do Whale Watching. Dolphins and the tropical species of Pilot Whales are easy to watch in Tenerife, Palma, Gomera or El Hierro. Sperm whales and marine birds frequent the area also. Some very good spots also for Astronomy lovers. The visits to the big observatory and telescope in La Palma are suspended by now, it seems, but the visitor center is opened. See http://www.gtc.iac.es/ http://www.gtc.iac.es/ In short Tenerife is the most complete in terms of variety of ecosystems and Lanzarote is probably the most spectacular geologically. If you want nature avoid the most crowded destinations that receive zillions of tourists searching for beach and booze.