Well, not exactly. There aren't any "gay beaches" here per se since most of them are at state parks. Having said that however, there are lots of places to go.
Green Lakes State park is very nice, though can be very crowded sometimes. It's the closest for me so it's where I hang out weather & time permitting. I think 'parking' is up to $8.00 at NYS parks now, but if you walk or bicycle in it's free.
Jamesville Beach and Oneida Shores are operated by Onondaga County Parks. They're okay....
Sylvan Beach on Oneida lake can be a very happening place with the waterfront bars, amusement park, and various other goings on. It tends to attract the partying crowd more.
Probably the "gayest" beach in the area is Southwick Beach State Park, on Lake Ontario near Ellisburg. When you get to the beach there is the usual guarded areas with kids etc and the usual state park b.s. rules. Turn left and head south. The beach runs a couple of miles, with dunes and everything. Guys will walk down quite a ways and hang out
While technically illegal there are nude sunbathers there- I've always just worn a thong and never been bothered. There are some drawbacks however. If you're planning on staying a while you've got to tote in enough water for the day. There's poison ivy everywhere
, so be careful if you leave the immediate beach area. The deer ticks are rampant, watch out for them. And it's about a 70 mile drive from Syracuse up I-81.
Hope this helps.