Hi folks, I've been on a few of the dive sites on Long Island. I've been diving some areas of Long Island for a few years. Yes, the tides are key but just check out the dive tables before you plan a dive.
Or, check out the schedule for the Long Island Dive Club (
Beach Diving: The Dive Club, Long Island NY) and go meet folks that, like you, are just looking for others to buddy up with.
If that schedule doesn't work for you, Dan Berg's book is great. I live in Nassau county so the trek to eastern Long Island is far for me. Beach 8th Street is a great dive, really easy, can't really get lost if you don't venture far from the cove. It just gets crowded there because of the popularity of the site and fisherman. Plus, for me, it's a small hike to Queens.
I like Caumsett Park but you need a SCUBA permit and buddy to access the beach. Plus it's $6 to get in. Not deep, only around 10-12 feet but easy enough access and no currents or boats. I haven't been in a while though so I don't have a permit anymore.
The Bayville Barge is a nice easy dive and you can find a "wreck". The site is residential so you have respect the area, keep noise to a minimum and mind where you park. This too is 8-10ft.
If you do wish to venture further east, there's Cedar Beach Jetties (medium), Secret Beach (easy), the Ponquoque Bridge (difficult) and Greenport Bridge (easy). You have to watch the tides for these.