Make sure you love it
Before you invest your hard-earned cash, make sure you like everything about the land and that there aren't any reasons you wouldn't want to buy it.
The seller knows the property best and is a great source of information. Ask her how long she's owned the property, why she's selling it and about other key issues, such as taxes and financing options.
Visit with the neighbors. Ask them questions about the property and what they like and dislike about the area. Doing so will also allow you to get to know them so you can determine if they're the kind of neighbors you want to be around.
Experience your property by camping on it for a night or two. This will help you alert you to any issues with traffic patterns or noise levels.