I also like the LHT--when I lived in the area, it was a bare-minimum of trails, but it has grown quite a bit in the 8 years between. From the Pole Farm, it is a short jaunt down Cold Soil Road to Terhune Orchards (which does wine now, too? Nice if you're into that...). There is also a pretty good cheese/dairy farm (Cherry Grove is the name, now) north on 206 not far from where the LHT leaves the Lawrenceville School. I would personally skip much of the rest of the things around there, since it's smaller places that every town seems to have, and not much to write home about. You can get into Princeton fairly easily from 206, by the way, though the town proper (Nassau Street) is super unfriendly to cyclists. Two popular places for take-out: Olives (high-brow) and Hoagie Haven (best described as 'college food truck'). Skip the town approaches from the canal, as they are all fairly steep by bicycle.
Another thought might be the Capital-to-Coast in the Allenwood area, but maybe check on the state of construction before you go--the area that passes under 34 is currently detoured onto the road, which is unfortunate, since it is pretty much in the middle of nowhere. The rest of the trail is flat (sloping gently downhill from Allaire Village), but there is a spur that heads out to the Wall recreation complex that adds several miles (and one unfortunately steep hill). Two possibilities occur when/if you hit the end of the trail in Manasquan: turn around, or poke your way out to the Sea Girt beachfront, and then work your way north. Once you get to Belmar, you can easily ride on the road/boardwalk (legally only until 10-12 depending on the municipality, but after Labor Day, nobody really cares as long as you aren't causing fights) pretty much all the way to Asbury Park. That would be, in a few words, A Long Ride. The current state of reality makes things difficult to really soak in the sights, but along the way there is the Allenwood General Store (good eats), a historic lighthouse (Sea Girt), the Spring Lake/Belmar/Avon area (which will roll up after Labor Day), several good places in Ocean Grove to eat (some of which are closed), and the Great Auditorium (which is worth seeing, even if you don't happen to catch any music). Asbury Park is across the lake from there (joined by the boardwalk, too). AP is largely open even after the tourist season, now. You CAN continue up the highway after Asbury, but there isn't a protected bike lane until you hit the northmost parts of Long Branch (technically, the sidewalk behind the seawall is only pedestrian, but--again--the locals tend to flaunt it after the season is done. After the Rumson-Seabright bridge, the seawall 'sidewalk' becomes an official bike path into Sandy Hook.
Just a quick note about the oceanside leg: I love my 'adopted' home (since I'll never be a "local"), but consider that headed from the AP boardwalk north is a popular road route, and you'll probably get several dirty looks/irritated blow-by passes. Also, a flat 40 mile round-trip ride might sound like heaven, but between the limited vistas (Water! Sand! Expensive houses!) and the omnipresent wind (which easily adds/subtracts 20-30 minutes in one direction), it can be absolutely maddening. In order to catch favorable wind, you would need to be finishing one direction (depending on which way it's going that day) by 9-10am.
