This is for those who absolutely cannot find the Hideout. 
I suggest you try a little harder before using this, but if 
you absolutely cannot then the directions are here:

1: Go to the riverwood dock (Image in Image Section)
2. Cross the stream infront on the dock.
3.Behind a fallen tree log, there is a hatch. 

That's the location! If you can't find the dock, its left of the 
front entrance to Riverwood.