One day in Tenerife

Going to Puerto de la Cruz next week and will hire a bike for one day.
What's the best route for an about 100km ride from there if I've only got one ride?
Up to the observatory and back down again? Or across the top to Masca and back? Or somewhere else?
Thanks all in advance.
What's the best route for an about 100km ride from there if I've only got one ride?
Up to the observatory and back down again? Or across the top to Masca and back? Or somewhere else?
Thanks all in advance.
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If I go again, I'll try to ride in the Anaga - walked in the Las Carboneras/Chinamada area and it is stunningly beautiful, and looks to have some cracking (and steep) climbs on good tarmac.