The natural pools of Bajamar turn Tenerife's rough north coast into a place you can actually swim. Atlantic water washes into protected lava-edge pools, with the open sea crashing just beyond the walls when the swell is running.
They are a practical add-on from La Laguna or Anaga rather than a full-day destination. Check sea conditions, bring sandals for wet surfaces, and remember that the drama of the waves is also the reason to respect closures and local warnings.