1- Visit the Aquarium of Seville
In the Aquarium of Seville there are 400 differentaquatic species and there are 5 different thematic zones: Guadalquivir, Atlantico, Pacific and Indo-Pacific; the idea is to reproduce the travel made by Magellan in 1519 around the world. the best activity you can do there is to sleep with the sharks.
The aquarium is opened every day from 10. it is located in the Muelle de las Delicias (Port of Seville) and it is easy to reach with bicycle or with the bus. the price is 15€ but on Thursday you can visit it for only 10€ from 15.00.
2-Visit a Museum
Another activity you can do in a rainy day is to visit a museum and in Seville there are a lot for every taste. For contemporary art is recommend the Andalusian Contemporary Art Museum. It is located in Monasterio de la Cartuja de Santa María de Las Cuevas and it is opened from Tuesday to Sunday.
Another option is to go to Maria Luisa Park and see the Archaeological Museum and the Popular Arts Museum.
3-Visit the Cathedral
The Cathedral is for sure in you list so you can visit it when the weather is bad so you don’t have to waste good sunshine time indoors. It is the biggest Gothic cathedral and third largest church in the world. Moreover it contains the tomb of Christopher Columbus, lots of gold and a stuffed crocodile.
One of the best way to spend a bad day is surely go shopping! In the Nervion there is a big shopping center and you can take the advantage of the fact that everyone else is stilt home to shop i peace.
5-Go to a Tapas Bar
Sharing food and staying with friends is the perfect thing to do in a bad day. In Seville there are a lot of bars or restaurants, you can also organize a tour!