Sue,
Check out the Planet Maze (
http://www.planetmaze.com/) which is great for kids of all ages. There is indoor play area, laser tag, games, and mini-golf.
Old Pro Golf as well offers birthday parties. Their 68th Street location has indoor and outdoor courses, arcade area, and small cafe. Their website is
http://oldprogolf.com/.
The other option I would recommend is the Carousel - they have an indoor ice rink that you could rent for a private party. Their website is
http://www.carouselhotel.com/.
Happy 6th birthday to your grandson and hope you have a great weekend!
Thank you,
Anna G.