I usually just walk the whole line (or at least from Queens Blvd to Rockaway Blvd as it's only 3 miles). I'd say the Queens Blvd to Rockaway is pretty good if you're waiting for it, but the best places are probably Kew Gardens, Metropolitan Ave, Jamaica Ave, Atlantic Avenue, and Rockaway Ave. JFK's pretty good to, you might wanna look out for any a**hole-type security folks if you decide to fan there...