I would agree, contact a local professional (preferrably 3) and have them provide a Comparable Market Analysis. You will get a range of value from each. The property will vary in value depending upon location, amount of wetlands, utilities, water/sewer, road, etc. There are many variables.
The first place to start, would be your property assessment notice. Double that figure and you will have the amount Conklin area government has valued the land.