I actually started this hobby after moving into a new house last month, and oddly enough, the house is uniquely suited for RC racing.
http://i38.photobucket.com/albums/e104/DBCustom/poolarea.jpg
The house I moved into had a in ground swimming pool in the back yard at one time, but due to cracking back in the 80s, they filled in the pool with dirt and left it. I have been slowly cleaning up the backyard and found that the entire pad around the pool is intact, with only a couple of small cracks that can be repaired with quik-crete or mortar. It looks like the whole length is semi-finished concrete, so I doubt there will be any drifting happening on this track, and as long as it is kept swept it will make a nice place to test top speeds on mild engine mods. The straightaways are about 20' for the long sides and 12' for the short ends, with a width of the short ends being nearly 4' and the long straights being about 3'. I have some conveyor belting that is 4' wide, so we are going to make banked turns at both ends which will be partially suspended on a wooden framework, and to border the inside and outside edges of the track I am planning on using solid plastic yard trim, to keep cars from going off the track on accident. There is a small flat area that is adjacent to one of the long straights that appears to be concrete as well, so I am thinking of putting in a pit area, making it kind of a NASCAR track that can be used by cars with speed mods on them.
Since the inside of the track was filled in with dirt, and I need to clean it up a bit as well, I am thinking about making a dirt track for racing off-roaders as well, putting moguls, banked turns and maybe a couple of switch-backs in there with some jumps, but that will wait until I get the regular track finished.
The basement of the new house also has a painted concrete floor (black and white checkerboard) that I am planning on making an indoor trakc on as well. The square footage of the basement room is nearly 700', so pretty wide and long, which makes me think that I can make a sectional track using PVC boarders to optimize the space since this is also my in home workshop and computer room/office. The only problem I have with this floor is that I have stage 2 motors in many of my cars, so they have a tendency to power slide/drift around corners down there or when you accelerate they "spin out" in the direction of the power tires. I have found that AWD will help prevent the spin outs while accelerating, but the corners I think will just make a nice challenge for drivers to overcome.
I will post pictures as I get things moving along, but wanted to get started on posting this so people could give me ideas on this.