The airport overlook is a little out of the way, but once you find the signs it's easy to get to. Unfortunately, planes on the runway nearest the overlook tend to be taking off, not landing. This means that they take off usually about halfway down the runway, a ways off from the overlook. If you can get to the overlook when the winds are out of the south instead of the north, I imagine you'll get a much better view of planes landing rather than taking off.
There are picnic tables for a nice picnic, and plenty of benches right at the front of the overlook. It's a great place to visit on a sunny afternoon.