Birds

These are some birds you are likely to see around the water.
Mallard Duck

There are many kinds of wild ducks, and even more types of domesticated ducks, but the Mallard is a good representative of all. Ducks are harmless. Bring some bread along, I never met a duck that didn't expect to be fed.
More: Ducks, Geese, Swans ...
These are all long-legged, long-necked wading birds typically seen near the water's edge. They will tolerate your approach to a point, and then fly away - one of the advantages of being a bird.
Snowy Egret

The Snowy Egret is very easy to spot, because it makes no attempt at camouflage, and stands out in any environment. They make up for this by being rather wary, although I have seen individuals beg for food from fishermen, a learned behavior that is not common. The Snowy Egret is very common; it would be difficult to go out kayaking and not spot at least one.
More: Egrets & Herons ...
Osprey

Ospreys, or "Fish Hawks", are surprisingly common, and can be found just about anywhere. You'll typically see them flying high over the water from a tree on one side to a tree on the other, occasionally diving down on some unlucky fish. Ospreys are usually seen alone, but mating pairs stay together, and I think young siblings stay together for a while as well. Ospreys are one of the biggest birds that you are likely to see. A single species has an almost worldwide distribution - pretty much everywhere except Australia.
More: Ospreys & Eagles ...
These birds are all associated with marine environments, but the truth is, they don't care. You'll find them wherever there is food. Since no place in New Jersey is really very far from the ocean, you can find most of these almost anywhere.
Herring Gull

More: Gulls, Terns, etc ...

Kayaking is an outdoor activity. Yes, kids, you'll have to put down your game controllers and go outside. Out there is what us older folks call nature. Nature can actually be quite beautiful and interesting, and you don't have to worry about your screen resolution and refresh rate - both are infinity. So here is a short list of flora and fauna ( plants and animals ) that you might see in freshwater environments:
More: Wildlife ...