Windsurfing and kiteboarding in Aruba is completely different than at many other places across the world: all year round wind, sunny tropical weather, little rain, boardshorts, shallow and turqouise water and beautiful sandy beaches.
Moreover, wind conditions are ideal year-round. The best time for Aruba is January to September with the North East trade winds in the 18 to 27 knot range. The rainy season isn't bad and you should get decent winds October to December - just a bit lighter.
Boardwalk Hotel Aruba is conveniently located right across from the wind and kitesurfing beach, called the Fisherman's Huts.