We have been doing some survey work -- trying to determine the best spot for a homesite, well, septic tank and pole barn. It is tough going as parts of the forest are very thick with shrubs and vines. But so far we think we have a site picked out.
One tool that I "built" is our water level. It works pretty well for what it is. It can determine the elevation difference of two spots up to 40 feet apart -- and you can go around trees. It is actually very accurate.