Almost all state Depts of public health maintain detailed logs on all water wells when they’re first dug and later re-tested. Check the log for any problems reported at your well and properties near you. If there are a bunch of new wells dug that you can’t pin on just new development, that could be a bad sign that your well is next if the aquifer levels are falling. See how deep the nearby wells had to go, and research what your budget needs to be if you have to do the same. I mean wells do get old and fail, it’s not the end of the world. But you really do want savings socked away for it, so you’re in a position to act immediately.
Walk the whole place methodically. Lots of old farms have a dump area(s). If you find junk, make it a condition of closing that it’s been hauled off b4 closing.
Look for a recent survey on file in Planners office, or else pay for a boundary survey. Home inspector won’t do this, it’ll be a couple grand.
Research the fence laws in your county and learn how they apply to you. For example, in a “Right Hand Rule” state, neighbors stand at the middle of their shared fenceline, and you are responsible to maintain everything to your right, and he has to maintain everything to the (you guessed it) left. BUT it’s not always the case. Gets a bit funky if the land was previously subdivided…