Travel Distances and time
To steal an earlier piece of advice from the lady who calls herself, "justagirl", I suggest you get a good map, layout the places you need to go, calculate minimum travel times, and that will tell you how much time you will have left for detours, stop-overs, and byways. Most good travel atlases (I use the Rand McNally one) have a mileage table between major cities that can be used for rough estimates. On the major interstate highways over long distances, a general rule of thumb is you can plan for averaging about 60 miles an hour, including short stops for gasoline and food but not stops for sightseeing. On US-numbered highways, you can estimate averaging 45 mph unless that highway goes through an unusually high number of mid-and-large-sized towns and then it will be less. On less developed roads, you may have trouble averaging 35 mph. Of course, weather, accidents, road construction, detours, and lots of hills and curves can also have an impact on those estimates. I encourage you to allot enough time so you can take a few hours everyday for seeing new things and not feel really pressed to get somewhere. On a trip like yours, I usually plan on averaging no more than 250-300 miles per day. That gives me plenty of time to see what's around the corner and over the hill. Have a great trip.
Amazon for all its faults...
Amazon.com. is a good way to get superb maps. Our personal recommendations for paper maps can be found at http://www.roadtripamerica.com/maps/maps.htm
Rather than purchase mapping software, I suggest using the free (to consumer) resource of NavTech at www.mapblast.com We use it nearly every day.
Mark