Whether active, extinct or otherwise, volcanoes are amazing testaments to nature's brute strength. Be a volcanologist for a day and explore the geological wonders of Bandama Caldera.
You're spoiled for sightseeing choice when staying in Las Palmas de Gran Canaria. Bandama Caldera is a great place to start here, but there are lots of other interesting spots to check out. San Telmo Park, Gran Canaria Stadium, and Cathedral of Santa Ana are close to the geological phenomenon and will fill in your day nicely.