Note, can be had cheaper depends on what option you choose, how many days you stay and extras etc ,also flight cost can vary ,example i found a flight via ryanair 7th March for a family four RETURN for £104 all in
Note the site is in German but pretty easy to navigate, can also copy over text to google translate if you find it easier
This place looks amazing!
An expedition through the tropical rainforest, a stroll along the beach of the South Seas, the water slide, a buffet in the Sawadee, the elegant Thai house - and much more is possible in the tropical island of Krausnick. Set off in the enchanting Bali lagoon, you can enjoy sandstones, palm trees, typical monkey cliffs and Balinese huts. Or build sandcastles on the 200-meter-long beach of the South Seas. Look forward to a Mediterranean ambience full of surprises. The choice of attractions is great, the fun of it is much bigger. You can stay either in a cozy tent, directly in the tropical landscape or in the comfortable room
You can get the bus outside Berlin Tegel airport, then change at Berlin Central Berlin change on to the train - times do vary so check before you travel.
you can also book via hoppa for a private transfer https://www.hoppa.com/en/
code TRANSFER20 should knock 20% off or get a taxi outside the airport but think that'll be more expensive.