Your best chance is out on the water, especially around the southwest coast and on the right boat or kayak trip.
Places like the waters around Costa Adeje, Los Cristianos, and La Caleta come up often, and Playa del Puertito is another spot people talk about.
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Turtles are there, but they’re not guaranteed, so don’t expect a neat little appearance on cue. If you do spot one, it’s usually a brief, quiet thing, which is exactly why people remember it.