Dakhla is quite a sure thing as Prikkebaard says, up till November at least.
Here's a quick write up on my blog that shows the set up and what to expect: http://www.skyhooked.co.uk/?p=530
I stayed at Dakhla Attitude; step out of your bedouin tent onto the edge of the lagoon. Lush. So that would be my choice for easy learning...
Canary Islands - Lanzarote is especially nice. It's very tranquil once away from the airport; kite lessons can be had at Famara Beach but it doesn't come close to the flat water conditions of Dakhla. Maybe it would be a good place to learn to fly a kite with a cool instructor, then head over to Dakhla to finish off.
Lanzarote has fantastic restaurants and culture which Dakhla, being at the arse end of the Saraha Desert does not (though it does have it's own beauty for sure).