There is a small place called Briana's Bananas Cafe in a strip on the bayside of 118th St, across from the Carousel hotel. They have some vegan options.
Also, there is a Greene Turtle near there, and their menu, including allergen info, is online.
As long as they are broiled, crab cakes are usually safe when avoiding dairy. Just ask at a restaurant to make sure how they are prepared.