There is so much stuff to do in Gijón, whether you're travelling for beach tourism, for cultural reasons, or both. Revillagigedo Palace is one of the most famous places to visit in Gijón and show a sample of the Asturian palace architecture of the 18th century. It is located in the neighborhood of Cimadevilla, the oldest district of the city and one of the top Gijón attractions -- it was originally home to the city's fishermen. In this area, the historically-minded tourist will find several archaeological remains from the time of the Roman Empire, particularly the spa, which is one of the most historic attractions in Gijón.
The University of Gijon, high on the list of modern things to see in Gijón, is the most important architectural work of the 20th century in Asturias and the largest building in Spain.
If you prefer sand between your toes, one of the things to do in Gijón is swimming at the three most popular beaches: Playa de Poniente, Playa Arbeyal, and Playa de San Lorenzo. The latter is famous for its fine golden sand and crystal-clear water, so taking a dip there has to be one of the top Gijón activities.
Ask the users of minube if you're still wondering what to do in Gijón, because there is still a lot more to list, like Isabel La Católica Park, Plaza Mayor, Museo Casa Natal de Jovellanos, Palacio Valdes ... all with the city's particular charm.