There are at least two marinas that rent boats within twenty minutes of Sampson. If you are into back road driving and exploring, our roads are very drivable, even most of our seasonal limited maintenance are passable except at the wettest times. Sampson is the East shore of Seneca, drive West a few miles you hit Cayuga. You can wander North or South for 50 miles and still be between the lakes. We have a large Amish population and you will see them working the fields, wonderful vistas of the lakes, stunning evening colors A camera is a must.
If you like a more, "wilderness" experience Hector National Forest is just south of Sampson and has many miles of hiking trails.
Sampson in my mind is more of a base camp that a destination camp, although I surely have gone there just to stay many times.