Owning a peice of vacant land can be a downright money drain, all you ever get from it is tax bills never any income until you decide to sell it. There are many ways to make money off of the land before selling it.
The trees on the land can be cut down and sold and replanted again. All types of vegetables can be raised for resale depending on your area of the country. Livestock can also be raised and sold. Windmills and cell towers can be put on your land by someone else and you be paid a monthly rent. You could also subdivide the land depending on your local laws and sell off smaller sections. Hunters will pay to hunt on your land.
In conclusion there are many possibilities to make money on vacant land. You just have to be a little creative in the ways you look at it. The ideas are but a small number which exist.