Capturing overnighters with a 16 mile round trip to the main road is a tough fight. It will be even tougher without any natural draw such as a well known attraction or a moderately sized town. You will need to advertise like mad to begin with.
My advice would be to make the building of the park your last step. Investigate the costs of substantial advertising and insurance. Be sure your zoning allows it. Zoning often requires site surveys, public hearings, engineering reports and on and on.
It is my third hand understanding that New York can be a real pain when it comes to regulatory rules. This will be especially true with potable water that is not a municipal system. The wastewater disposal system, the size and location of bathrooms, ADA requirements are all regulated and if you do it wrong the regulators don't offer backsies . There may very well be fire codes regarding roads, site density, access and the like. Be sure your roadmap to building that park is clear of all the pitfalls before you start moving dirt.