Originally Posted by CMK10

I stayed at the AC by Marriott Atocha and it's a very pleasant hotel. I'd probably skip the taxi at least for the ride into the city as the Metro is fairly quick (probably 40 minutes) and far cheaper. Plus, then you arrive at prime dinner time.

For your full day, if you want to see a museum you can't go wrong with either the Prado or the Renia Sofia. Also, the large park Parque del Retiro is a must see, even in winter. It's also a great city just to walk around in. Stop by the Mercado San Miguel for a coffee, hit a tapas bar, enjoy the people watching. I was there last December and the weather was fairly pleasant too. Enjoy your visit!