The first throw should be made from some point even with or behind the green boxes. The target will not be visible from the start, so it is advisable to make sure you know where you are aiming.
There are several strategies for getting around the overhanging trees here. It should also be noted that aiming too far to the left can result in a disc under (or on top of) the shelter.
The par course sign is the target. Again, any part of the sign will count as a hit. The target will not be visible until you get pretty close, but you can see the bathrooms to the right of the target from the start.
Course Update: There is a new par course sign in the same spot pictured above. The branches of the tree near the bathroom are sometimes allowed to grow much lower to the ground, sometimes cut completely away.