Anything involving Wittenberg or Cornell is worth it. I have not been to either myself, but have hiked in the area, and based on the pictures of the view, its on my next to do list for the 'Skills. http://a4.ec-images.myspacecdn.com/images01/64/89a4915371e71dfaa38a26e8f23751ea/l.jpg
You could go up Panther Mountain and Giant Ledge from Fox Hollow, do Slide/Cornell/Wittenberg, down to Woodland Valley, and back over Giant Ledge and Panther Mtn. Alternatively, from the south you could climb Peekamoose and Table mountains, down across the Neversink river, up Slide/Cornell/Wittenberg, down to Woodland Valley, but back to the south this time. Either way is an out and back combined with a loop (not too many true loops exist in the Catskills). Panther Mountain and Giant Ledge offer "better" views but Peekamoose and Table will be more secluded, especially on weekends. Slide will be a little crowded no matter what, since its the high point of the Catskills. A cool spot for a campsite, if its still legal at that spot (its right around the 3500' line, above which there is no camping), is in the col between Slide and Cornell. The map shows a spring, I have no idea what the details are. All in all, that area of the Catskills is a great area, you'll have a lot of fun any way you go.