Bull's Island in Lambertville, NJ is a state camp ground, On one side you have the feeder of the D&R canal and on the other side you have the Delaware river. Both are great for fishing and tubing. The river has a wing dam, which you can sit below and get a massage or take your tube and enjoy your ride through the middle of the dam. You can drift to shore and hike back up stream and do it over and over. There is a small boat there also.