This feature has improved with the recent tree triming, but it still has potential for problems. Words can't do this feature justice regarding it's 'uniquness'- scout first or go with someone who's done it. Essentially your dropping it while pointing diagonally right, eddying out as fast as possible to avoid going into the trees.

From the riverwalk trail, or specifically, park at the 20th street pond parking lot and head to the opposite side of the pond. It's the first place you can see the river, from the paved path, heading counter-clockwise.