A few days from Baltimore
Welcome aboard the RoadTrip America forum.
Your plan so far sounds like the way many of my own RoadTrips have started out. I think what you most need at this point is a solid idea of where four days, say, will get you from Maryland. With stops along the way to see the sights, I don't think you can count on getting to the Rockies. As an example, when I moved to Tucson, I made the drive from the DC area in 4 days, but made no stops on the way, So, I'm going to suggest that you make a pretty big loop and see the south, the Mississippi River and the Great Lakes. From Memphis, you could head up river to St Louis and Chicago, go around Lake Michigan and back home by way of Niagara Falls. At about 2900 miles that would require you to cover just over 350 miles a day for 8 days and would let you see a considerable chunk of the country. But that's just one idea. You'll need to get out a map of the US, see what a loop that size looks like and then start looking for places on a similar sized loop that you'd like to go to. For further ideas, keep checking the forums for where other people are headed and see what appeals to you. And don't forget to check out all the other planning ideas, tools, and hints available to you with a simple click of the ROADTRIP PLANNING button at the top of the page. And happy planning!
AZBuck