I was in Maspalomas for Pride in May 2019. They had an outdoor foam party during the daytime at the Yumbo Centre, so I took almost everything off and danced in my thong underwear. There's a photo of me in my profile wearing the thong and covered in foam.
i am just back from gran canaria . the beach and dunes are good to wear thongs and the box bar in the yumbo centre is good too . i was wearing thongs in the box and also on the terrace outside the bar