El Medano is 10 minutes drive from the Airport, but will be busy in August (more crowded than in this video). It should be hot and Trade Windy.
There are plenty of videos - this one shows Kite Beach in the South Bay at the start, then up at El Muelle (Harbour Wall) which gets the cleanest waves and ends with one kite out at Cabezo in the North Bay (which usually is almost a windsurf-only spot) with lots of rocks and heavy onshore waves.