Your Kitesurfing destination is Cabo Frio!(excellent!)
Not a big expert here,but I saw how guys enjoy practicing this sport here.
The bay is about 15 km wide and has loads of places to kite.
You can launch nearly anywhere along the long sandy beach!
The best spot is directly in front of the hostel "Hoopika Gardens".
This spot is pretty good for surfing as well.
15 min. from the hostel is the laguna which has excellent kiting as well with flat water.
Cabo Frio is excellent for begginers and experienced kiteboarders alike!
The wind in Cabo Frio is constant and there are often waves further out for those that want to go wave jumping...