Amenities in NY are pretty typical compared to other states with toll roads, as far as I have seen. A couple of fast food outlets, a coffee shop, convenience store, gas, restrooms (including 1 single-occupant unisex), tourist info, wifi is the typical set of amenities. Many locations have a farmer's market during the growing season.
-Sloatsburg (NB between 15A and 16) is by far the largest single-direction facility and the only one with two public levels. This one also has a parking garage.
-Directly opposite is Ramapo (SB between 16 and 15A), the smallest service area. This is basically a glorified McDonald's and, before the 1990s, required crossing the Thruway via a bridge to Sloatsburg for most services.
-Angola (both directions between 57A and 58) is the only facility in the median. Parking lots and fuel on the outside of the roadways, building in a wide median accessible by enclosed bridges. Angola is about the same size as Sloatsburg, but it serves both directions.
-New Baltimore (both directions between 21B and 21A) has a separate rest area/tourist info center/playground accessible only from NB.
-A closed pair of service areas is on the Berkshire Spur east of the Castleton-on-Hudson Bridge. These closed shortly after I-90 through Albany opened due to a lack of traffic.
-Combined service areas and welcome centers were planned on I-90 WB near Exit B3 and I-90 EB near Exit 61 in the 1990s, but never built. McDonald's would have been a major funding partner.