We recommend kite sizes in between: 7-10 (this is according to the weight of the sailor and the wind intensity). Ideally bring 2 different sized kites and 2 boards.
Downwind with surfboard with Strap is always the better option, but twin tip will be a lot of fun too. You can also bring: replacement fins, bars, and lines which are warmly welcome. Camelback backpack is extremely important as well.
It’s good to bring 1 suitcase for clothes, 02 kites, 02 boards (twin -tip and surfboard). Also sunscreen, long sleeve lycra, cap, sunglasses, and your GoPro