Trick-or-treaters stopped by the Grand Lodge Waterpark Resort in Rothschild Monday afternoon.
It was all for the third annual "Grand Halloween Event".
Organizers said they had more than 35,000 treats to hand out to children.
The event also featured a performance of Michael Jackson's "Thriller".
Organizers said the event is a safe and fun place for families to enjoy Halloween.
"I think that as we continue to evolve and as we continue to grow that the community is definitely starting to see this as a great event annually," said Tim Van De Yacht, Grand Lodge Waterpark Marketing Director.
Children who dressed up in costumes for the one-day event also got a free pass to the waterpark.
Organizers estimate about 3,500 people came out for the Halloween fun.
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