I was the instructor this summer at the Alvor KIte Center and massively recommend the lagoon (Ria de Alvor) for learning. Its the perfect place to improve your riding and always has very flat (mid-low tide) or slightly choppy (high tide) water. There's loads of space, especially now that its september and fewer people around. If you want more info feel free to message me, check out alvorkitecenter.com or email
info@alvorkitecenter.comMatt