Anyone know of a travel agency or travel service in New York city which specializes in sustainable travel?

I would like to know of a New York City-based business that offers eco-tourism or sustainable travel options, especially for honeymoons.

the best things available out there are best offered on the net...

also if you use AMEX, they have their own travel company that offers everything and anything... and if they don't offer it, they will design something to get it for you....