Winter Kingdom is probably the best time to come here. Starts in late November and lasts untill mid January. It was completely empty during the weekend! The wait for all the attractions was exactly 0 minutes. We could go straight through the queuing zones right into the roller coasters and we even did few of them several times, without even getting out of the cars! The crew in the park is super friendly and nice. There are some special Christmas things happening for children like meeting the Santa, elfs, parades, writing letters, ice ring, and many other attractions. We were visiting as adults, so we didn't do those activities but it still took us whole day to enjoy all the coasters and other attractions and grabbing some stuff to eat and drink. There was very good mulled wine, also as option nonalcoholic which was amazingly good, some nice Christmas polish food to try like pierogis, barszcz, bigos, oscypek etc. The quality of food was very good. Everything is nicely labeled in both Polish and English. The carpark was pretty empty. The whole area is massive. It's good to buy a bracelet for storage boxes as soon as you can, as it costs 12zl and will make it easy to leave your stuff before each attraction in designed zones, also to go on Hyperion you must completely empty your pockets so you will need this bracelet anyway. Churros were also amazing and solo good. There are very nice areas with burning wood, where you can get warm when visiting. We had amazing time, and I hope more people will visit this place in winter!

Also pro tip for winter: make sure you have hood on and some tight chimney scarf and gloves, helps a lot to enjoy the roller coasters, also it's good to have a head band instead of a hat - will not fly away when you go 140km/h on Hyperion :)

Also, in winter (december) all roller coasters (except the water ones) were open, so we enjoed Zadar, Mayan, Hyperion etc :)