It is easy to get to the park. When you get off the subway you should see an exit on both your left and right. Take the left exit. Once outside, go on the bridge and walk the entire length of it. You should now be on the other side of the street. Straight ahead you will see a shuttle station. A shuttle comes around about every 15 minutes or so that can take up the hill to where the park is. If you don't want to wait for the shuttle, you can also walk up the hill.