Rt 93-Exit 32 or Exit 33, up in Stink'n Lincoln, NH:
www.sledventures.com which also rents out atv-four wheeler's that have four fat tires for when the snow is not here.
Distance from Exit 23-New Hampton, the lakes region, driving north up Rt 93 to Exit 33 - Stink'n Lincoln is about 33-miles, or maybe 30-minutes, driving time.