I found it in between one giant mirror and the other (on the hill closest to the large hill where you race el- whatever his name is). There's a dune bud there. Spray it. It will go down as stairs into a small space with coins. Before time runs out, spray the wall in front of you. A picture of a shine will show. When you fully spray it, a shine will come out I forget where it lands, but when you find it... FREE SHINESPRITE!