Welcome to cruisersforum.
Much written here on navigating the East River into LIS,
just
google "East river, hell gate, cruisersforum"
Certainly the East river and Hell gate is to be respected but with a look out
for debris, going with a favorable
current and making sure you are not in a
situation with strong
wind opposing
current (could make for standing waves at the gate)
just enjoy the city and the 9 bridges you will pass under.
From Sandy Hook/Atlantic Highlands you should be able to ride current all the way into the sound, and further east with a favorable current.
Is less than 30 nm from Sandy hook to LIS, will take 4-5 hours with current on 40 ft
boat.
Stay west of Roosevelt Island as there is a low bridge on east side.
Stay north of Steppingstone Light/rocks after Throgs Neck bridge.
Can stay in Manhasset Bay on free yellow moorings for a few days or
anchor
with good protection/holding. (Is my home base)
Entire LIS has current of approx. half
knot until you get to eastern sound
where it narrows and again you really want current with you.
Also at the
Race at Fishers Island current must be with you.
Enjoy