Looking for more about irish movie in the late 80's about two kids, a leprechaun, a cave, a unicorn, and a waterfall? The kids get lost or they leave home the leprechaun helps them get back to their family the kids are brother and sister they ride a canoe.

The Great Land of Small (http://www.imdb.com/title/tt0093116/)?

Thanks now I have to find it, hopefully it's the one... Oy vey. I have been looking for this movie for the past 10 years.

I think its called "behind the waterfall"