<< If your property is outside of city limits, then you could probably do whatever you wanted to it. Although, if it was on the side of a highway there could be some other government regulations to consider. >>
AFAIK, this is close to correct. In a city or town proper, you have a lot of building codes to deal with, but if your land is outside of city limits you have a lot more freedom in what you can do. Also, the codes depend on the city/town. Where I live, you can build a 10x10 shed without permits or anything, but if it's over 10x10, you need a permit (and a cement foundation). To the best of my knowledge there is no limit to the number of 10x10 sheds you can build provided they do not become a demonstrable eyesore to the neighbors.
Regarding the hypothetical tractor into the side of your house, I do not think that you could be cited provided that no-one is injured. However, if you are personally injured (or worse, if you injure an "innocent" bystander) then you can (and probably will) be cited. Traffic laws are not enforcable on private property either, if you have enough property to build a road you can let your 3 year old drive on it if you like. Of course, if the kid injures himself then you can be charged with child endangerment or some such thing. Basically, provided there is no damage to anyone's property but your own (and provided you do not intend to make an insurance claim on said damaged property) AND provided that there are no injuries to any person/animal you can pretty much do whatever you want on your own property so long as you are not a disturbance AFAIK.
ZV