The summary is:
Rebecca Zamolo and her friends go to Mr. Nice Guy's house, who has a giant water park and a collection of items from their previous adventures. They try to trade with him to see what's inside his locked refrigerator, but he gives them a riddle to solve. They split up and find clues in different parts of the water park, but Mr. Nice Guy turns out to be evil and traps them in a tree house.
Some possible facts extracted from the text are:
1. The text is a transcript of a YouTube video by Rebecca Zamolo.
2. The video is about visiting Mr. Nice Guy's house, which has a giant water park and a three-story tree house.
3. Mr. Nice Guy is a mysterious person who wears a Lego mask and trades with various people, including the Red Hood Spies.
4. Rebecca and her friends are looking for a five-digit code to open a refrigerator that contains Mr. Nice Guy's newest and most exciting gadgets and gear.
5. They have to solve riddles that lead them to different clues in the water park and the tree house.
6. The clues are pool balls with numbers on them, and they find four of them in total.
7. They also encounter a pirate who trades with Mr. Nice Guy and tries to get a black reactivator, which is a device of unknown function and power.
8. At the end of the video, Mr. Nice Guy traps them in the tree house and reveals himself as not being nice at all.