The gay beach in Gran Canaia is located behind the dunes of Playa del Ingles/ Maspalomas. You can take a nice walk through the beautiful dunes from the Riu Palace. It's about a 30 minute walk. You can also take a taxi to the light house in Maspalomas, from there it's about 20 minute walk but less up and down on the hills.
The beach is clothing optional, you can rent chairs and umbrellas and there is a popular beach bar. Sometime the wind can be strong, which makes the stay less pleasant.