Direction to boat ramp.
If you go over the Wonderwood bridge on I 295 headed North take the Heckscher Dr. exit and turn right. If you are headed South on I-295 take the Heckscher Dr. exit and turn left. At the light turn left (North) on New Berlin Rd. and you will go about 3 ½ miles and you will come to Cedar Point Rd. Turn right and stay on Cedar Point Rd. for about 7 miles and the entrance of the ramp is on your left. The ramp is in a remote area if you have never been their before. At one point you will have to turn right to stay on Cedar Point Rd.
GPS settings 9023 Cedar Point Rd. Jacksonville, Fl. then drive on .3 miles to the ramp. Google Maps link is here
Directions on National Park Service Site is at this link