Surfed down waterfall

Catherine was in my dream last night. She is an ex that I'm on good terms with still and recently engaged. In the dream, we went and got our nails done then went on this crazy hike . Throughout the day we secretly hooked up when no one was around. We get to this waterfall in the mountains and visi a castle at the top. Part of the waterfall flowed through the castle. Then we got chased by something (can't remember, maybe her fiance, something magical). I think there were some witches after us as well (might be where I'm getting the magic from). So we used magic to escape the castle by surfing down the waterfall