I mainly surf NY/NJ area when waves are good and foil when conditions are subpar/windy and/or small. First of all waves in NY are mainly lefthanders, NJ righthanders.
NY
For foil, Rockaway - from the 110s to the 60s -sucks for the most part bc as mentioned above, there is no offshore wave breaking, it can be pretty dumpy/hollow and waves tend to break along jetties, and there are now all year round crowd and surf school. So not a great combo. I had success before they dredged sand toward Jacob Riis park which is quieter/not crowded bc waves are not great for surfing. Unfortunately sand replenishment killed the break.
From the 60s to the 30s, it is more open and there might be something, haven’t checked in a long time. The 40s are usually a shelter spot when waves are big/too big . Around the 30s and offshore you have the Rockaway shoal that few pros surf by boat. As mentioned above, A LOT of wildlife under the surface.
Further East, you have Long Beach/in town area. Pretty much the same deal, although that at high tide you might find better waves for foiling. Since the new jetties extensions, it changed spots a lot, and you now have these sandbars by the jetties tip, then a deep pocket of water that fills in quickly with the tide. If you look at LB cams on Surfline, the birdview one at low tide, you will see what I am talking about.
Then you have Lido area, usually lot of surfers but a bit quieter by Pacific beach. I had success foiling there in the past during the off season; need to be checked as sandbars come and go.
But overall, Lido is shallow with hollow waves. During Summer, pay parking, lifeguards, crowd…forget about it.
The next 2 break, you will need a 4x4 and permit that is not sold during peak season, permit deadline was April 30th.
Gilgo beach can be a great option for foiling, depending of sandbars ( haven’t checked since December ) because it is very wide and if you drive further than the entrance you can find waves with no crowd/no surfers. Best breaks for surfing tend to be by the entrance so just avoid these.
Then even further, you will have Robert Mose/Democrat Point. Demo is my favorite, it is a long lefthanders point break breaking on sand. It can break for hundred of yards when good, and packed with surfers. But at high tide when waves are sectiony/too fat it is a lot of fun.
NJ
Similar to Demo, you might want to check Sandy Hook, same, waves can break for hundred of yards there, and when swell is maxing out, you can find smaller waves the further North you go.
Then from Sandy Hook to Manasquan, there are miles of beaches. Problem is that you don’t really have offshore sandbars/waves breaking but of course along the coast you can find something. NJ tends to have pretty punchy and hollow waves, so not exactly foil friendly. Near Belmar area, some guys foil and you have Green Hat shop in NJ that might be a good source of intel. They are organizing a foil event on May 15th at Monmouth Beach.