There are two indoor climbing walls in Las Palmas. Feel free to share your experience in the comments!
Indoorwall Gran Canaria
Indoor climbing gym Indoorwall is located in the north east of La Isleta at Calle Dr. Juan Domínguez Pérez 47. Open daily.
https://goo.gl/maps/G9EiXKj7rch2Mcea9
Sala Tagorock Climbing
This indoor climbing gym is located on the other side of Las Canteras, close to La Cicer at Calle Covadonga 20. They are closed on Sundays.