Named for the former queen of Spain, this gorgeous Belle Époque hotel has been celebrating the high life since 1912. It is situated in one of the country's most fashionable seaside resorts, surrounded by promenades and gardens overlooking the sea. Guest rooms and suites have been decorated in understated period style, while house restaurants offer a more eclectic experience, from Basque cuisine to Vietnamese flavors. For relaxation, the Hydra Wellness Center & Spa offers a sauna, steam rooms and hydro-massage areas. As for activities within walking distance, guests can easily stroll to antique shops, perfumeries, confectionaries and a white sand beach — the latter is just steps from the hotel's front door.