Once you get to the coordinates, look for the signal and find the cache. Don't worry you'll get a sign that your in the right area.
Although best done at night, you can come in the daylight and take in a beautiful view of the river.
Parking on McKinnon Dr can be easier as its more of a trail from there. Be careful approaching at night as the road can be busy.
Good luck!
Note that the beacon is power by the sun. Approaching at around sunset is reccommended