Not in Jersey.. but an easy drive away..Come check out the Hudson.. here's a place to pitch your tent
http://nysparks.com/parks/98/details.aspxThe river up here is perfect for a boat like yours..Well charted and marked, great scenery, lots of history.. and the fishing can go from good to sick depending on the time of year and what you are after..keep in mind that a large portion of the Stripers that we'll fish for off NJ all season, will be swimming by here to spawn at some point between late april- late june..
Stripers aside, the Largemouth/smallmouth bass fishing is some of the best in the state, plus an assortment of other species to target.. panfish, catfish, tiger muskies etc, etc.. In the summer, folks will be out tubing, rafting/partying in coves, or just cruising around.. but you'll find plenty of elbow room most of the time.. Lots of places to put in..you could launch anywhere from Kingston to Hudson, depending on how much river you want to explore