On one side of land you can find sea with waves high for 1-1.5m. On the other side (South) of land there's an enormous bay - great place with shallow water - it's one of the moste amazing places in Europe for any water activities. The water is so shallow that you can stand on the ground even 500m from the shore. The gulf water is quite flat. Only when it blows strong (6 Bft and more)you will find some chops.
The best sand, very fine and soft, no rocks, no shells, no pebbles, no dangerous things in the water. The beaches are very big and wide so there is no problem with kite landing or launching. It's a bay which can be used in any wind direction if you have a car. If you don't than you can always chose betwen bay or see. On the sea side the beach is large enough to prepare your gear to launch - on the gulf side the situation isn't so good. It depends on which camp you are at. Very crowded in summer time.
Rather cold, you always need a wetsuit. Beginning of season from May till July: water about 15°C, air up to 20°C. From end of July till beginning September: water about 22°C, air up to 34°C. End of season: from September till October: cold water 12°C, air 16°C.
Off-season possible, if not ice on the water, but only with very thick clothes.
Generally it blows from West/Southwest directions what means side/sideonshore winds. In June and July the wind is quite stable. More stable when it blows from East (rare). When it blows from North - it's better to try surfing on the sea. Winds aren't too strong. The best winds are in May and June (often 4-5 Bft) in the middle of summer you've got to hunt for it with forecasts. At the south end N and S winds will be sideshore.
Airplane: Gdansk or Warsaw and then Gdansk. Bus: to Wladyslawowo
Train: to Wladyslawowo. Then a taxi, auto-stop or bus and then you have to choose which from 8 camps you prefer. In my opinion the best are number 1, than 3 and 6. First you've got to get to Gdansk or someting called Trojmiasto (you have there aglomeration of 3 cities). From Gdansk you take main road to North. This road will drive you to a city called Reda. In Reda before the church turn right and follow the beacon. It's about 50/60 km from Gdansk.