North Lake is a nice loop, and I know Sullivan County has many nice loops. I havent been over that way yet, but just by looking at my map the Willowemoc Wild Forest looks great. Theres several loops over there around Frick Pond and Mongaup Pond. Denman Mtn I believe has a firetower, and thats a loop too. That is in Sundown Wild Forest, near the Ulster County border.
If you want to look at Delaware County there are also some nice loops over by Mud Pond and Trout Pond. I havent been there yet either, but I have to get over that way this spring. In Delaware County and Sullivan you would probably be on land that rolling, slightly lower in elevation, and abundant ponds and small lakes. Have fun and let us know how it is.